Format

Send to

Choose Destination
Nat Commun. 2014;5:3232. doi: 10.1038/ncomms4232.

Correlated spin currents generated by resonant-crossed Andreev reflections in topological superconductors.

Author information

1
Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
2
1] Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China [2] Institute for Advanced Studies, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.
3
Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan.

Abstract

Topological superconductors, which support Majorana fermion excitations, have been the subject of intense studies due to their novel transport properties and their potential applications in fault-tolerant quantum computations. Here we propose a new type of topological superconductors that can be used as a novel source of correlated spin currents. We show that inducing superconductivity on a AIII class topological insulator wire, which respects a chiral symmetry and supports protected fermionic end states, will result in a topological superconductor. This topological superconductor supports two topological phases with one or two Majorana fermion end states, respectively. In the phase with two Majorana fermions, the superconductor can split Cooper pairs efficiently into electrons in two spatially separated leads due to Majorana-induced resonant-crossed Andreev reflections. The resulting currents in the leads are correlated and spin-polarized. Importantly, the proposed topological superconductors can be realized using quantum anomalous Hall insulators in proximity to superconductors.

Supplemental Content

Full text links

Icon for Nature Publishing Group Icon for PubMed Central
Loading ...
Support Center