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We construct a new model of two-dimensional quantum spin systems that combines intrinsic topological orders and a global symmetry called ?avour symmetry. It is referred as the bilayer Doubled Semion model (bDS) and is an instance of symmetry-enr[...]texto impreso
We study the helical edge states of a two-dimensional topological insulator without axial spin symmetry due to the Rashba spin-orbit interaction. Lack of axial spin symmetry can lead to so-called generic helical edge states, which have energy-de[...]texto impreso
Ortiz Martín, Laura ; Varona Angulo, Santiago ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2018-02-01We study the localization and oscillation properties of the Majorana fermions that arise in a two-dimensional electron gas (2DEG) with spin-orbit coupling (SOC) and a Zeeman field coupled with a d-wave superconductor. Despite the angular depende[...]texto impreso
Esta tesis, titulada Órdenes topológicos en espines y fermiones: fases cuánticas y computación, pretende resaltar la importancia que las fases topológicas de la materia han adquirido en los últimos años y resumir los resultados que hemos obtenid[...]texto impreso
Dauphinais, Guillaume ; Ortiz Martín, Laura ; Varona Angulo, Santiago ; Martín Delgado, Miguel Ángel | IOP publishing ltd | 2019-05-29We present a full quantum error correcting procedure with the semion code: an off-shell extension of the double-semion model. We construct open-string operators that recover the quantum memory from arbitrary errors and closed-string operators th[...]texto impreso
Varona Angulo, Santiago ; Ortiz Martín, Laura ; Viyuela, O. ; Martín-Delgado Alcántara, Miguel Ángel | IOP publishing ltd | 2018-10-03We compute the topological phase diagram of 2D tetragonal superconductors for the only possible nodeless pairing channels compatible with that crystal symmetry. Subject to a Zeeman field and spin-orbit coupling, we demonstrate that these superco[...]
