Autor(es): Sacramento, Pedro ; Araújo, Miguel ; Castro, Eduardo
Data: 2014
Identificador Persistente: http://hdl.handle.net/10174/10847
Origem: Repositório Científico da Universidade de Évora
Assunto(s): acoplamento de spin-órbita; supercondutores topológicos; condutividade de Hall; fermiões de Majorana
Topological superconductors (TSCs) may undergo transitions between phases with different topological numbers which are related to the presence of gapless (Majorana) edge states. In a TSC the charge Hall conductivity, σxy, is not quantized and evolves continuously between different topological phases. Here we show that in two-dimensional Z-TSC the derivatives of σ_xy display sharp features signaling the topological transitions. We consider in detail the case of a triplet superconductor with p-wave symmetry in the presence of Rashba spin-orbit coupling and externally applied Zeeman spin splitting. We generalize to the cases where the normal system is already topologically non-trivial.
