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Seminars & Lectures

* TITLE

Time reversal anomaly in Josephson effect involving Majorana fermions

* SPEAKERS

Name	Affiliation	E-mail
Suk Bum Chung	University of California	sbchung(at)physics.ucla.edu

* HOST(Applicant)

Name	Affiliation	E-mail
Suk Bum Chung	University of California	sec(at)apctp.org

* DATE / TIME

2012-09-24, 2:00PM

* PLACE

APCTP Seminar room (Hogil Kim Memorial Bldg.-512)

* ABSTRACT

The Majorana surface state is a protected feature in a class of superconductor known as \'topological superconductors\'. In this paper, we study the Josephson coupling between time-reversal invariant topological superconductors and s-wave superconductors. The Majorana surface states of time-reversal invariant topological superconductors in all physical dimensions have a generic topological property which we named as time-reversal anomaly. Due to the time-reversal anomaly, the Josephson coupling prefers a nonzero phase difference between topological and trivial superconductors. The nontrivial Josesphon coupling leads to a half period Josephson oscillation for a small enough DC voltage bias, which, however, reverts to the ordinary Josephson oscillation under an in-plane magnetic field. This provides an experimental signature of Majorana fermions in a time-reversal invariant superconductor.

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