VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Wednesday 7

› 16:50 - 17:10 (20min)
Anomalous supercurrent due to spin-orbit interaction in one dimensional semiconductor nanowire
Tomohiro Yokoyama  1@  , Mikio Eto  2@  , Nazarov  3@  
1 : Center for Emergent Matter Science (CEMS), RIKEN institute
2-1 Hirosawa, Wako, Saitama 351-0198 -  Japan
2 : Faculty of Science and Technology, Keio University
3-14-1 Kohoku-ku, Yokohama, Kanagawa 223-8522 -  Japan
3 : Kavli Institute of Nanoscience, Delft University of Technology
Lorentzweg 1, Delft 2628 CJ -  Netherlands

In SNS Josephson junction, electron and hole in the normal region are coherently coupled to each other by the Andreev reflection, forming the Andreev bound states. Since the supercurrent is carried through the Andreev bound states, the electronic property significantly affects the Josephson effect. In this study, we investigate the Josephson junction using quasi-one dimensional semiconductor nanowires (NWs) with strong spin-orbit (SO) interaction, e.g., InSb NW, and reveal an anomalous supercurrent due to the SO interaction.
We apply a tight-binding model for the NW and perform a numerical simulation. In the NW, several impurities and the Rashba-type SO interaction are considered. The Zeeman effect is also taken into account in the NW. In the presence of magnetic field, the interplay between SO interaction and Zeeman effect results in an asymmetric dispersion relation for electron. Then, the Andreev bound states receive an additional phase shift accompanied by electron and hole transports, and the anomalous Josephson effect is induced. In consequence, the critical current is different in the positive and negative direction in the presence of more than one conduction channels in the NW.

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