{"id":21,"date":"2023-10-17T21:26:00","date_gmt":"2023-10-17T19:26:00","guid":{"rendered":"http:\/\/members.ifimac.uam.es\/atomelix\/?page_id=21"},"modified":"2024-04-13T10:29:23","modified_gmt":"2024-04-13T08:29:23","slug":"research-lines","status":"publish","type":"page","link":"https:\/\/members.ifimac.uam.es\/atomelix\/research-lines\/","title":{"rendered":"Research Lines"},"content":{"rendered":"<ul>\n<li style=\"text-align: justify\"><span style=\"font-size: 12pt\"><a href=\"#molecular-electronics\">Molecular Electronics<\/a><\/span><\/li>\n<li style=\"text-align: justify\"><span style=\"font-size: 12pt\"><a href=\"#optoelectronics\">Optoelectronics<\/a><\/span><\/li>\n<li style=\"text-align: justify\"><span style=\"font-size: 12pt\"><a href=\"#two-dimensional-materials\">Two-Dimensional Materials<\/a><\/span><\/li>\n<li style=\"text-align: justify\"><span style=\"font-size: 12pt\"><a href=\"#topological-insulators\">Topological Insulators<\/a><\/span><\/li>\n<li style=\"text-align: justify\"><span style=\"font-size: 12pt\"><a href=\"#quantum-hall-efffect\">Quantum Hall Efffect<\/a><\/span><\/li>\n<li style=\"text-align: justify\"><span style=\"font-size: 12pt\"><a href=\"#quantum-dots\">Quantum Dots<\/a><\/span><\/li>\n<li style=\"text-align: justify\"><span style=\"font-size: 12pt\"><a href=\"#vortex-matter\">Vortex Matter<\/a><\/span><\/li>\n<\/ul>\n<h4 id=\"molecular-electronics\" style=\"text-align: justify\"><span style=\"font-size: 14pt\">Molecular Electronics<\/span><\/h4>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><span class=\"C9DxTc \"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-174 alignleft\" src=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/images_large_nn2c11410_0005-300x169.jpeg\" alt=\"\" width=\"397\" height=\"224\" srcset=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/images_large_nn2c11410_0005-300x169.jpeg 300w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/images_large_nn2c11410_0005-768x433.jpeg 768w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/images_large_nn2c11410_0005-200x113.jpeg 200w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/images_large_nn2c11410_0005.jpeg 930w\" sizes=\"auto, (max-width: 397px) 100vw, 397px\" \/><\/span><\/p>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><span class=\"C9DxTc \">In the foreseeable future, the functionality of electronic devices will rely on the quantum conduction of nanoscopic regions composed of a number of atoms that can range between several thousands down to a single one. The ultimate limit in this miniaturization process is represented by metallic nanocontacts or atomic contacts. In this regard, the most promising research field within nanoscale electronics is probably what is known as molecular electronics. The main goal of molecular electronics is to fabricate functional units for electronic circuits out of very stable and well-characterized molecules such as porphyrins, phtalocyanines, fullerenes, PAH&#8217;s (polycyclic aromatic hydrocarbons) or even molecules as large as carbon nanotubes. Graphene deserves attention on its own.<\/span><\/p>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><strong><span class=\"C9DxTc \">Some representative publications:<\/span><\/strong><\/p>\n<ul>\n<li><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:Xnn2mF3JXD4C\">Nonequilibrium magneto-conductance as a manifestation of spin filtering in chiral nanojunctions, <\/a>MA Garci\u0301a-Bla\u0301zquez, W Dednam, JJ Palacios, The Journal of Physical Chemistry Letters 14 (35), 7931-7939 (2023).<\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><a class=\"XqQF9c\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:UO6ax3c-pNsC\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc \">A group-theoretic approach to the origin of chirality-induced spin selectivity in non-magnetic molecular junctions<\/span><\/a><span class=\"C9DxTc \">,<\/span><span class=\"C9DxTc \">\u00a0<\/span><span class=\"C9DxTc \">W. Dednam, M.A. Garc\u00eda-Bl\u00e1zquez, L.A. Zotti, E.B. Lombardi, C. Sabater, and J. J. Palacios, ACS Nano 17, 6452\u22126465 (2023).<\/span><\/li>\n<li dir=\"ltr\" role=\"presentation\"><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:RmQ8dt0hH3oC\">Constrained DFT for Molecular Junctions, <\/a>LA Zotti, W Dednam, EB Lombardi, JJ Palacios, Nanomaterials 12 (7), 1234 (2022).<\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \"><a href=\"https:\/\/journals.aps.org\/prb\/abstract\/10.1103\/PhysRevB.102.245415\">Refined electron-spin transport model for single-element ferromagnetic systems: Application to nickel nanocontacts<\/a>,\u00a0<\/span><span class=\"C9DxTc \">W Dednam, C Sabater, O Tal, JJ Palacios, AE Botha, MJ Caturla, Physical Review B 102 (24), 245415 (2020).<\/span><\/li>\n<li dir=\"ltr\" role=\"presentation\"><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;cstart=20&amp;pagesize=80&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:0aNKY9CYzMkC\">Quantum transport in oxidized Ni nanocontacts under mechanical strain, <\/a>Z Razavifar, A Saffarzadeh, JJ Palacios, Physical Review B 101 (23), 235442 (2020).<\/li>\n<li dir=\"ltr\" role=\"presentation\"><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;cstart=20&amp;pagesize=80&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:lAfYOIClFDQC\">Revealing the geometry and conductance of double-stranded atomic chains of gold, <\/a>C Sabater, JJ Palacios, MJ Caturla, C Untiedt, The Journal of Physical Chemistry C 124 (49), 26596 (2020).<\/li>\n<li dir=\"ltr\" role=\"presentation\"><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;cstart=20&amp;pagesize=80&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:vJdfVD8-6ZYC\">Resonant transport and electrostatic effects in single-molecule electrical junctions, <\/a>C Brooke, A Vezzoli, SJ Higgins, LA Zotti, JJ Palacios, RJ Nichols, Physical Review B 91 (19), 195438 (2015).<\/li>\n<li dir=\"ltr\" role=\"presentation\"><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;cstart=20&amp;pagesize=80&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:pZYLKkizsIQC\">Theory of projections with non-orthogonal basis sets: Partitioning techniques and effective Hamiltonians,<\/a> M Soriano, JJ Palacios, Physical Review B 90, 075128 (2014).<\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \"><a href=\"https:\/\/journals.aps.org\/prb\/abstract\/10.1103\/PhysRevB.88.134417\">Kondo effect and spin quenching in high-spin molecules on metal substrates<\/a>,\u00a0<\/span><span class=\"C9DxTc \">D. Jacob, M. Soriano, J.J. Palacios, Physical Review B 88, 134417 (2014).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Critical comparison of electrode models in density functional theory based quantum transport calculations,\u00a0<\/span><span class=\"C9DxTc \">Jacob, D.; Palacios, J. J., Journal of Chemical Physics 134, 044118 (2011)<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">The Kondo effect in ferromagnetic atomic contacts,\u00a0<\/span><span class=\"C9DxTc \">Calvo, M. R.; Fernandez-Rossier, J.; Palacios, J. J.; et al., Nature 458, 1150 (2009).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">First-principles phase-coherent transport in metallic nanotubes with realistic contacts,\u00a0<\/span><span class=\"C9DxTc \">J. J. Palacios, AJ P\u00e9rez-Jim\u00e9nez, E Louis, E SanFabi\u00e1n, JA Verg\u00e9s, Phys. Rev. Lett. 90, 106801 (2003).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Fullerene-based molecular nanobridges: A first-principles study,\u00a0<\/span><span class=\"C9DxTc \">Palacios, J. J.; Perez-Jimenez, A. J.; Louis, E.; et al., Physical Review B 64, 115411 (2001)<\/span><\/li>\n<\/ul>\n<h4><span style=\"font-size: 14pt\">Optoelectronics<\/span><\/h4>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><span class=\"C9DxTc \"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-178 alignleft\" src=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/Screenshot-2024-02-26-at-11.00.26-300x280.jpg\" alt=\"\" width=\"272\" height=\"254\" srcset=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/Screenshot-2024-02-26-at-11.00.26-300x280.jpg 300w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/Screenshot-2024-02-26-at-11.00.26-768x718.jpg 768w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/Screenshot-2024-02-26-at-11.00.26.jpg 796w\" sizes=\"auto, (max-width: 272px) 100vw, 272px\" \/>The creation of free electron and hole pairs may suffice to broadly explain the optical conductivity of insulators and semiconductors, but, in general, bound electron-hole pairs or excitons also play a non-negligible role. This is particularly true in two-dimensional (2D) crystals, where the excitons become tightly bound due to their confinement and low screening. These include, for instance, hexagonal boron nitride or transition metal dichalcogenides, which have been extensively studied in this regard. Additionally, it has also been shown that non-linear phenomena such as high-harmonic generation and bulk photovoltaic effects can be greatly enhanced in 2D crystals. Furthermore, the high tunability of the atomic structure through strain and the ability to select excitations based on the light polarization render 2D optoelectronics as a very active field from both fundamental and technological perspectives.<\/span><\/p>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><strong><span class=\"C9DxTc \">Some representative publications:<\/span><\/strong><\/p>\n<ul>\n<li><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:rMiSbtrAJs8C\">Efficient computation of optical excitations in two-dimensional materials with the Xatu code<\/a>, AJ Ur\u00eda-\u00c1lvarez, JJ Esteve-Paredes, MA Garc\u00eda-Bl\u00e1zquez, JJ Palacios, Computer Physics Communications 295, 109001 (2024).<\/li>\n<li><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:i9B0nK2ie9AC\">Shift Current with Gaussian Basis Sets and General Prescription for Maximally Symmetric Summations in the Irreducible Brillouin Zone, <\/a>MA Garci\u0301a-Bla\u0301zquez, JJ Esteve-Paredes, AJ Uri\u0301a-A\u0301lvarez, JJ Palacios,\u00a0 Journal of Chemical Theory and Computation 19 (24), 9416-9434 (2023).<\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><a class=\"XqQF9c\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:BjLbhSWBl98C\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc \">A comprehensive study of the velocity, momentum and position matrix elements for Bloch states: Application to a local orbital basis<\/span><\/a><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">JJ Esteve-Paredes, JJ Palacios, SciPost Physics Core 6 (1), 002 (2022).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><a class=\"XqQF9c\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:G60ApcfeQaAC\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc \">Theoretical Approach for Electron Dynamics and Ultrafast Spectroscopy (EDUS)<\/span><\/a><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">G Cistaro, M Malakhov, JJ Esteve-Paredes, AJ Ur\u00eda-\u00c1lvarez, REF Silva, &#8230; Journal of Chemical Theory and Computation (2022).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><a class=\"XqQF9c\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;cstart=20&amp;pagesize=80&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:6TexfgwXQfYC\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc \">Quenching of exciton recombination in strained two-dimensional monochalcogenides<\/span><\/a><span class=\"C9DxTc \">, JJ Esteve-Paredes, S Pakdel, JJ Palacios, Physical Review Letters 123 (7), 077402<\/span><a class=\"XqQF9c\" href=\"https:\/\/scholar.google.es\/scholar?oi=bibs&amp;hl=en&amp;cites=15157039208394691660\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc \">4<\/span><\/a><span class=\"C9DxTc \">\u00a0(2019).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><a class=\"XqQF9c\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;cstart=20&amp;pagesize=80&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:c2LjitseEfMC\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc \">Strong modulation of optical properties in rippled 2D GaSe via strain engineering<\/span><\/a><span class=\"C9DxTc \">, D Maeso, S Pakdel, H Santos, N Agra\u00eft, JJ Palacios, E Prada, &#8230; Nanotechnology 30 (24), 24LT01 (2019).<\/span><\/li>\n<\/ul>\n<h4><\/h4>\n<h4 id=\"two-dimensional-materials\" style=\"text-align: justify\"><span style=\"font-size: 14pt\">Two-Dimensional Materials<\/span><\/h4>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><span class=\"C9DxTc \"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-180 alignleft\" src=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/nanoac3ce2f1_hr-300x107.jpg\" alt=\"\" width=\"398\" height=\"142\" srcset=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/nanoac3ce2f1_hr-300x107.jpg 300w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/nanoac3ce2f1_hr-768x275.jpg 768w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/nanoac3ce2f1_hr.jpg 1000w\" sizes=\"auto, (max-width: 398px) 100vw, 398px\" \/>Graphene is an allotrope of carbon, whose structure is one-atom-thick planar sheets of sp<\/span><span class=\"C9DxTc \">2<\/span><span class=\"C9DxTc \">-bonded carbon atoms that are densely packed in a honeycomb crystal lattice.<\/span><span class=\"C9DxTc \">\u00a0<\/span><span class=\"C9DxTc \">The term\u00a0<\/span><span class=\"C9DxTc \">graphene<\/span><span class=\"C9DxTc \">\u00a0was coined as a combination of graphite and the suffix -ene by Hanns-Peter Boehm, who described single-layer carbon foils in 1962.<\/span><a class=\"XqQF9c\" href=\"http:\/\/en.wikipedia.org\/wiki\/Graphene#cite_note-Boehm1962-2\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc aw5Odc \">\u00a0<\/span><\/a><span class=\"C9DxTc \">Graphene is most easily visualized as an atomic-scale chicken wire made of carbon atoms and their bonds. The crystalline form of graphite consists of many graphene sheets stacked together. Since its discovery, many other two-dimensional materials have appeared, including, to name a few, transition metal dichalcogenides, phosphorene, antimonene, magnetic CrI3, etc.<\/span><\/p>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><strong><span class=\"C9DxTc \">S<\/span><span class=\"C9DxTc \">ome representative publications:<\/span><\/strong><\/p>\n<ul class=\"n8H08c UVNKR \" style=\"text-align: justify\">\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Franckeite as an exfoliable naturally occurring Topological Insulator,\u00a0<\/span><span class=\"C9DxTc \">WS Paz, MG Menezes, NN Batista, G Sanchez-Santolino, M Velicky, &#8230; Nano Letters 21, 7781-7788 (2022).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Exfoliation of Alpha\u2010Germanium: A Covalent Diamond\u2010Like Structure,<\/span><span class=\"C9DxTc \">\u00a0C Gibaja, D Rodr\u00edguez\u2010San\u2010Miguel, WS Paz, I Torres, E Salagre, &#8230; Advanced Materials 33 (10), 2006826 (2022).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Few-layer antimonene electrical properties,\u00a0<\/span><span class=\"C9DxTc \">P Ares, S Pakdel, I Palacio, WS Paz, M Rassekh, &#8230;Applied Materials Today 24, 101132 (2021).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Franckeite: a naturally occurring van der Waals heterostructure,\u00a0<\/span><span class=\"C9DxTc \">AJ Molina-Mendoza, E Giovanelli, WS Paz, MA Ni\u00f1o, JO Island, &#8230; Nature Communications 8, 14409 (2017).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Isolation and characterization of few-layer black phosphorus<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">A Castellanos-Gomez, L Vicarelli, E Prada, JO Island, &#8230;<\/span><span class=\"C9DxTc \">\u00a0<\/span><span class=\"C9DxTc \">2D Materials 1, 025001, (2014)<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Hydrogenation-induced ferromagnetism on graphite surfaces<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">M Moaied, JV Alvarez, JJ Palacios<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">Physical Review B 90, 115441 (2014)<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Magnetism-Dependent Transport Phenomena in Hydrogenated Graphene: From Spin-Splitting to Localization Effects<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">Leconte, N.; Soriano, D.; Roche, S.; Charlier, J. C.; Ordej\u00f3n, P.; Palacios, J. J.<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">Acs Nano 5, 3987 (2011)<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Origin of the quasiuniversality of the minimal conductivity of graphene<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">Palacios, J. J.<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">Physical Review B 82, (2010).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Giant Magnetoresistance in Ultrasmall Graphene Based Devices<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">Mu\u00f1oz-Rojas, F.; Fern\u00e1ndez-Rossier, J.; Palacios, J. J.<\/span><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">Physical Review Letters 102, (2009)<\/span><\/p>\n<\/li>\n<\/ul>\n<h4 id=\"topological-insulators\" style=\"text-align: justify\"><span style=\"font-size: 14pt\">Topological Insulators<\/span><\/h4>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><span class=\"C9DxTc \">\u00a0<img loading=\"lazy\" decoding=\"async\" class=\" wp-image-188 alignleft\" src=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/Bi-1-300x242.jpg\" alt=\"\" width=\"319\" height=\"257\" srcset=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/Bi-1-300x242.jpg 300w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/Bi-1.jpg 523w\" sizes=\"auto, (max-width: 319px) 100vw, 319px\" \/>A topological insulator is a material that behaves as an insulator in its interior or bulk while permitting the movement of charges (metallic) on its surface. In the bulk of a topological insulator the electronic band structure resembles an ordinary band insulator, with the Fermi level falling between the conduction and valence bands. On the surface of a topological insulator there are special states that fall within the bulk energy gap and allow surface metallic conduction. Carriers in these surface states have their spin locked at a right-angle to their momentum (spin-momentum locking or topological order). At a given energy the only other available electronic states have opposite spin, so the &#8220;U&#8221;-turn scattering is strongly suppressed and conduction on the surface is highly metallic. These states are characterized by an index (known as Z2 topological invariants) similar to the genus in topology, and are an example of topologically ordered states.<\/span><\/p>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><strong><span class=\"C9DxTc \">Some representative<\/span><span class=\"C9DxTc \">\u00a0<\/span><span class=\"C9DxTc \">publications<\/span><span class=\"C9DxTc \">:\u00a0<\/span><\/strong><\/p>\n<ul style=\"text-align: justify\">\n<li><a href=\"https:\/\/arxiv.org\/abs\/2401.07970\">Topologically protected photovoltaics in Bi nanoribbons<\/a>, AJ Ur\u00eda-\u00c1lvarez, JJ Palacios, arXiv preprint arXiv:2401.07970 (2024).<\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><a class=\"XqQF9c\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:dZbaGXT4iR0C\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc \">Deep learning for disordered topological insulators through their entanglement spectrum<\/span><\/a><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">AJ Ur\u00eda-\u00c1lvarez, D Molpeceres-Mingo, JJ Palacios, Physical Review B 105, 155128 (2022).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><a class=\"XqQF9c\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:JG67p0iyyesC\" target=\"_blank\" rel=\"noopener\"><span class=\"C9DxTc \">Franckeite as an exfoliable naturally occurring topological insulator<\/span><\/a><span class=\"C9DxTc \">,\u00a0<\/span><span class=\"C9DxTc \">WS Paz, MG Menezes, NN Batista, G Sanchez-Santolino, M Velicky, &#8230; Nano Letters 21, 7781-7788 (2021).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Laser-Beam-Patterned Topological Insulating States on Thin Semiconducting MoS2,<\/span><span class=\"C9DxTc \">\u00a0H Mine, A Kobayashi, T Nakamura, T Inoue, S Pakdel, D Marian, &#8230; Physical Review Letters 123 (14), 146803 (2019).<\/span><\/li>\n<li class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Topologically protected quantum transport in locally exfoliated bismuth at room<\/span><span class=\"C9DxTc \">\u00a0<\/span><span class=\"C9DxTc \">temperature<\/span><span class=\"C9DxTc \">,<\/span><span class=\"C9DxTc \">C Sabater, D Gos\u00e1lbez-Mart\u00ednez, J Fern\u00e1ndez-Rossier, JG Rodrigo, &#8230;<\/span><span class=\"C9DxTc \">\u00a0<\/span><span class=\"C9DxTc \">Physical Review Letters 110, 176802 (2013).<\/span><\/li>\n<\/ul>\n<h4 id=\"quantum-hall-efffect\" style=\"text-align: justify\"><span style=\"font-size: 14pt\">Quantum Hall Efffect<\/span><\/h4>\n<div class=\"oKdM2c ZZyype Kzv0Me\" style=\"text-align: justify\">\n<div id=\"h.544cd2dc46836f0c_180\" class=\"hJDwNd-AhqUyc-Clt0zb Ft7HRd-AhqUyc-Clt0zb jXK9ad D2fZ2 zu5uec OjCsFc dmUFtb\">\n<div class=\"jXK9ad-SmKAyb\">\n<div class=\"tyJCtd mGzaTb Depvyb baZpAe\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\"><span class=\"C9DxTc \"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-193 alignleft\" src=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/csm_Quanten-Hall-Effekt_f78229ce66-300x173.jpg\" alt=\"\" width=\"367\" height=\"211\" srcset=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/csm_Quanten-Hall-Effekt_f78229ce66-300x173.jpg 300w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/csm_Quanten-Hall-Effekt_f78229ce66.jpg 570w\" sizes=\"auto, (max-width: 367px) 100vw, 367px\" \/>The discovery of the quantum Hall effect (QHE) is a remarkable achievement in condensed matter physics awarded with two Nobel prizes. At low temperatures and in strong magnetic fields, it is found that the Hall resistance of a two dimensional electron system has plateaus as a function of the number of electrons. In the integer quantum Hall effect (IQHE), the Hall resistance at the plateaus turns out to be <\/span><span class=\"C9DxTc \">R=h\/ne\u00b2<\/span><span class=\"C9DxTc \">, where\u00a0<\/span><span class=\"C9DxTc \">n<\/span><span class=\"C9DxTc \">\u00a0is an integer. In the fractional quantum Hall effect (FQHE),\u00a0<\/span><span class=\"C9DxTc \">n<\/span><span class=\"C9DxTc \">\u00a0can be a fractional number. Apart from the fundamental interest of these highly correlated systems, due to the high precision of the measurement, the quantization of the Hall resistance is now used as the standard of resistance.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"oKdM2c ZZyype\" style=\"text-align: justify\">\n<div id=\"h.544cd2dc46836f0c_182\" class=\"hJDwNd-AhqUyc-Clt0zb Ft7HRd-AhqUyc-Clt0zb jXK9ad D2fZ2 zu5uec wHaque g5GTcb\">\n<div class=\"jXK9ad-SmKAyb\">\n<div class=\"tyJCtd mGzaTb Depvyb baZpAe\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\"><strong><span class=\"C9DxTc \">Some representative publications:<\/span><\/strong><\/p>\n<ul class=\"n8H08c UVNKR \">\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Skyrme crystal versus Skyrme liquid,\u00a0<\/span><span class=\"C9DxTc \">Paredes, B.; Palacios, J. J., Physical Review B 60, 15570-15573 (1999).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Numerical tests of the chiral Luttinger liquid theory for fractional Hall edges,\u00a0<\/span><span class=\"C9DxTc \">Palacios, J. J.; MacDonald, A. H., Physical Review Letters 76, 118-121 (1996).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Signature of quantum Hall effect Skyrmions in tunneling: A theoretical study,\u00a0<\/span><span class=\"C9DxTc \">Palacios, J. J.; Fertig, H. A., Physical Review Letters 79, 471-474 (1997).<\/span><\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h4 id=\"quantum-dots\" style=\"text-align: justify\"><span style=\"font-size: 14pt\">Quantum Dots<\/span><\/h4>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><span class=\"C9DxTc \">Electronic device miniaturization in semiconductors has reached the ultimate limit where the number of electrons present in the device can be tuned at will down to a single electron. These systems have been given the name of quantum dots or artificial atoms since their generic properties are determined by their few-electron configurations much the same as in real atoms. In the figure you can see the top view of a heterostructure where a voltage applied to the metal gates can confine the electrons in the two-dimensional electron gas underneath at will.<\/span><\/p>\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><strong><span class=\"C9DxTc \">Some representative publications:<\/span><\/strong><\/p>\n<ul class=\"n8H08c UVNKR \" style=\"text-align: justify\">\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">CORRELATED FEW-ELECTRON STATES IN VERTICAL DOUBLE-QUANTUM-DOT SYSTEMS,\u00a0<\/span><span class=\"C9DxTc \">Palacios, J. J.; Hawrylak, P., Physical Review B Volume: 51 Issue: 3 Pages: 1769-1777 Published: 1995.<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">LOW-LYING EXCITATIONS OF QUANTUM HALL DROPLETS,\u00a0<\/span><span class=\"C9DxTc \">Oaknin, J. H.; Martinmoreno, L.; Palacios, J. J.; et al., Physical Review Letters Volume: 74 Issue: 25 Pages: 5120-5123 Published: 1995.<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">CAPACITANCE SPECTROSCOPY IN QUANTUM DOTS &#8211; ADDITION SPECTRA AND DECREASE OF TUNNELING RATES,\u00a0<\/span><span class=\"C9DxTc \">Palacios, J. J.; Martinmoreno, L.; Chiappe, G.; et al., Physical Review B Volume: 50 Issue: 8 Pages: 5760-5763 Published: 1994<\/span><\/p>\n<\/li>\n<\/ul>\n<h4 id=\"vortex-matter\" style=\"text-align: justify\"><span style=\"font-size: 14pt\">Vortex Matter<\/span><\/h4>\n<div class=\"oKdM2c ZZyype Kzv0Me\" style=\"text-align: justify\">\n<div id=\"h.544cd2dc46836f0c_214\" class=\"hJDwNd-AhqUyc-Clt0zb Ft7HRd-AhqUyc-Clt0zb jXK9ad D2fZ2 zu5uec OjCsFc dmUFtb\">\n<div class=\"jXK9ad-SmKAyb\">\n<div class=\"tyJCtd mGzaTb Depvyb baZpAe\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\"><span class=\"C9DxTc \"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-183 alignleft\" src=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/vortices-300x200.jpg\" alt=\"\" width=\"300\" height=\"200\" srcset=\"https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/vortices-300x200.jpg 300w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/vortices-1024x682.jpg 1024w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/vortices-768x512.jpg 768w, https:\/\/members.ifimac.uam.es\/atomelix\/wp-content\/uploads\/sites\/15\/2024\/02\/vortices.jpg 1237w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/>Vortex matter refers to the state of matter where the magnetic field penetrates a superconducting condensate creating vortices.\u00a0 When the dimensions of the superconducting condensate are comparable to the coherence length only few vortices can coexist in the system. As shown in the figure and in contrast to the usual triangular arrangement in bulk, complex and unique vortex structures are expected to occur due to the competition between geometric confinement and vortex-vortex interaction. Many interesting analogies can be drawn between artificial atoms, type-II superconducting mesoscopic disks in perpendicular magnetic fields, or rotating Bose-Einstein condensates where the role of the electron is played in the latter cases, not by the Cooper pairs or the bosons, but by the vortices.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"oKdM2c ZZyype\">\n<div id=\"h.544cd2dc46836f0c_216\" class=\"hJDwNd-AhqUyc-Clt0zb Ft7HRd-AhqUyc-Clt0zb jXK9ad D2fZ2 zu5uec wHaque g5GTcb\">\n<div class=\"jXK9ad-SmKAyb\">\n<div class=\"tyJCtd mGzaTb Depvyb baZpAe\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\"><strong><span class=\"C9DxTc \">Some representative publications:<\/span><\/strong><\/p>\n<ul class=\"n8H08c UVNKR \">\n<li dir=\"ltr\" style=\"text-align: justify\"><a class=\"gsc_a_at\" href=\"https:\/\/scholar.google.es\/citations?view_op=view_citation&amp;hl=en&amp;user=XXgZ5JIAAAAJ&amp;cstart=20&amp;pagesize=80&amp;sortby=pubdate&amp;citation_for_view=XXgZ5JIAAAAJ:SQZOXlr1FBsC\">Long-range vortex transfer in superconducting nanowires,<\/a> R C\u00f3rdoba, P Or\u00fas, \u017dL Jeli\u0107, J Ses\u00e9, MR Ibarra, I Guillam\u00f3n, S Vieira, &#8230; Scientific reports 9 (1), 12386 (2019).<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\" style=\"text-align: justify\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Magnetic field-induced dissipation-free state in superconducting nanostructures,\u00a0<\/span><span class=\"C9DxTc \">R C\u00f3rdoba, TI Baturina, J Ses\u00e9, A Yu Mironov, JM De Teresa, MR Ibarra, &#8230; Nature communications 4 (1), 1437 (2013).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\" style=\"text-align: justify\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Critical fields for vortex expulsion from narrow superconducting strips,\u00a0<\/span><span class=\"C9DxTc \">Sanchez-Lotero, P.; Palacios, J. J., Physical Review B, 75 (2007)<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\" style=\"text-align: justify\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Fine structure in magnetization of individual fluxoid states,\u00a0<\/span><span class=\"C9DxTc \">Geim, A. K.; Dubonos, S. V.; Palacios, J. J.; et al., Physical Review Letters 85, 1528-1531 (2000).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\" style=\"text-align: justify\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" role=\"presentation\"><span class=\"C9DxTc \">Metastability and paramagnetism in superconducting mesoscopic disks,\u00a0<\/span><span class=\"C9DxTc \">Palacios, J. J., Physical Review Letters 84,1796-1799 (2000).<\/span><\/p>\n<\/li>\n<li class=\"zfr3Q TYR86d eD0Rn \" dir=\"ltr\">\n<p class=\"zfr3Q CDt4Ke \" dir=\"ltr\" style=\"text-align: justify\" role=\"presentation\"><span class=\"C9DxTc \">Vortex matter in superconducting mesoscopic disks: Structure, magnetization, and phase transitions,<\/span><span class=\"C9DxTc \">\u00a0JJ Palacios, Physical Review B 58, R5948 (1998).<\/span><\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Molecular Electronics Optoelectronics Two-Dimensional Materials Topological Insulators Quantum Hall Efffect Quantum Dots Vortex Matter Molecular Electronics In the foreseeable future, the functionality of electronic devices will rely on the quantum conduction of nanoscopic regions composed of a number of atoms that can range between several thousands down to a single one. The ultimate limit in&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_mo_disable_npp":"","footnotes":""},"class_list":["post-21","page","type-page","status-publish","hentry","no-post-thumbnail","entry"],"_links":{"self":[{"href":"https:\/\/members.ifimac.uam.es\/atomelix\/wp-json\/wp\/v2\/pages\/21","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/members.ifimac.uam.es\/atomelix\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/members.ifimac.uam.es\/atomelix\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/members.ifimac.uam.es\/atomelix\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/members.ifimac.uam.es\/atomelix\/wp-json\/wp\/v2\/comments?post=21"}],"version-history":[{"count":38,"href":"https:\/\/members.ifimac.uam.es\/atomelix\/wp-json\/wp\/v2\/pages\/21\/revisions"}],"predecessor-version":[{"id":270,"href":"https:\/\/members.ifimac.uam.es\/atomelix\/wp-json\/wp\/v2\/pages\/21\/revisions\/270"}],"wp:attachment":[{"href":"https:\/\/members.ifimac.uam.es\/atomelix\/wp-json\/wp\/v2\/media?parent=21"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}