Bulletin of the American Physical Society
APS March Meeting 2021
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session F52: Topological Superconductivity: Symmetry Breaking and Spin-Orbit Coupling
11:30 AM–2:06 PM,
Tuesday, March 16, 2021
Sponsoring Unit: DMP
Chair: Daniel Agterberg, University of Wisconsin - Milwaukee
Abstract: F52.00011 : Order Parameter and Edge Currents of a 2D Topological Superconductor under Consecutive Symmetry Breakings*
1:54 PM–2:06 PM
Manfred W Sigrist
(University of Zurich)
Specifically, we investigate for a two-dimensional superconductor with Rashba spin-orbit coupling (broken mirror symmetry) and an out-of-plane Zeeman field (broken time-reversal symmetry) how the superconducting order parameter adapts under these consecutive symmetry reductions. We then examine the emerging edge currents in a strip geometry in the different topological phases of this system, namely the trivial, the helical (class DIII), and the chiral (class D) phase.
Using both a Ginzburg-Landau and a microscopic approach, we find edge currents irrespective of the topology of the system and the associated edge states. Our study underscores how edge currents in topological superconductors derive mostly from the symmetry of the system.
*Swiss National Science Foundation
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