Hall conductivity as bulk signature of topological transitions in superconductors

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Sacramento, PD (Author) Other; Araujo, MAN (Author) Other; Eduardo V Castro (Author) Other

Journal

Title: Europhysics Letters

Vol. 105

ISSN: 0295-5075

Publisher: Institute of Physics Publishing

Indexing

ISI Web of Knowledge - 11 Citations

Scopus - 12 Citations

Other information

Authenticus ID: P-009-82R

DOI: 10.1209/0295-5075/105/37011

Abstract (EN): 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, sigma(xy), is not quantized and evolves continuously between different topological phases. Here we show that in two-dimensional Z-TSC the derivatives of sigma(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. Copyright (C) EPLA, 2014

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6