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Viyuela, O. ; Rivas, A. ; Gasparinetti, S. ; Wallraff, A. ; Filipp, S. ; Martín-Delgado Alcántara, Miguel Ángel | Nature Publishing Group | 2018-02-12Topological insulators and superconductors at finite temperature can be characterized by the topological Uhlmann phase. However, a direct experimental measurement of this invariant has remained elusive in condensed matter systems. Here, we repor[...]texto impreso
Cats, P. ; Quelle, A. ; Viyuela, O. ; Martín-Delgado Alcántara, Miguel Ángel ; Morais Smith, C. | American Physical Society | 2018-03-12We find a series of topological phase transitions of increasing order, beyond the more standard second-order phase transition in a one-dimensional topological superconductor. The jumps in the order of the transitions depend on the range of the p[...]texto impreso
We have applied the recently developed theory of topological Uhlmann numbers to a representative model of a topological insulator in two dimensions, the Qi-Wu-Zhang model. We have found a stable symmetry-protected topological phase under externa[...]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[...]texto impreso
Viyuela, O. ; Rivas, A. ; Martín-Delgado Alcántara, Miguel Ángel | American Physical Society | 2014-04-02We introduce the Uhlmann geometric phase as a tool to characterize symmetry-protected topological phases in one-dimensional fermion systems, such as topological insulators and superconductors. Since this phase is formulated for general mixed qua[...]
