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제목: Time-reversal anomaly in Josephson effect involving Majorana fermions

연사: 정  석  범 박사님 (UC Berkeley)

일시: 2012. 9. 20(목) 오전 11시


장소: 2nd floor, lounge room  (Bldg. #31)

초록: 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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