%0 Journal Article
%T Multiple Andreev reflection and critical current in topological superconducting nanowire junctions
%A Pablo San-Jose
%A Jorge Cayao
%A Elsa Prada
%A Ram¨Žn Aguado
%J Physics
%D 2013
%I arXiv
%R 10.1088/1367-2630/15/7/075019
%X We study transport in a voltage biased superconductor-normal-superconductor (SNS) junction made of semiconducting nanowires with strong spin-orbit coupling, as it transitions into a topological superconducting phase for increasing Zeeman field. Despite the absence of a fractional steady-state ac Josephson current in the topological phase, the dissipative multiple Andreev reflection (MAR) current I_dc at different junction transparencies is particularly revealing. It exhibits unique features related to topology, such as the gap inversion, the formation of Majorana bound states, and fermion-parity conservation. Moreover, the critical current I_c, which remarkably does not vanish at the critical point where the system becomes gapless, provides direct evidence of the topological transition.
%U http://arxiv.org/abs/1301.4408v3