1211.0338 (Chris L. M. Wong et al.)

Majorana Kramers Doublets in $d_{x^2-y^2}$-wave Superconductors with
Rashba Spin-Orbit Coupling    [PDF]

Chris L. M. Wong, K. T. Law

In this work, we show that a quasi-one-dimensional $d_{x^2-y^2}$-wave superconductor with Rashba spin-orbit coupling is a DIII class, time-reversal invariant, topological superconductor (TS) which supports a Majorana Kramers Doublet (MKD) at each end of the TS. A MKD is a pair of Majorana end states (MESs) protected by time-reversal symmetry (TRS). An external magnetic field breaks TRS and drives the system from DIII to D class in which case a single MES appears at each end of the TS. We show that a MKD induces resonant Andreev reflection with zero bias conductance peak of $4e^2/h$. Experimental realizations of the proposed model are discussed.

View original: http://arxiv.org/abs/1211.0338