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Title: Hall conductivity as bulk signature of topological transitions in superconductors
Authors: Sacramento, Pedro
Araújo, Miguel
Castro, Eduardo
Keywords: acoplamento de spin-órbita
supercondutores topológicos
condutividade de Hall
fermiões de Majorana
Issue Date: 25-Feb-2014
Publisher: Europhysics Letters
Citation: EPL 105, 37011 (2014)
Abstract: 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.
Type: article
Appears in Collections:FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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