Josephson Current through Semiconductor Nanowire with Spin--Orbit Interaction in Magnetic Field
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概要
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We theoretically study the DC Josephson effect of a semiconductor nanowire (NW) with a strong spin--orbit interaction when a magnetic field is applied parallel to the NW. We adopt a model of single scatterer in a quasi-one-dimensional system for short junctions where the size of a normal region is much smaller than the coherent length. In the case of a single conduction channel, we obtain analytical expressions for the energy levels of Andreev bound states E_{n} and supercurrent as a function of the phase difference \varphi between two superconductors. We show the 0--\pi transition by tuning the magnetic field. In the case of more than one conduction channel, we find that E_{n} (-\varphi ) \neq E_{n} (\varphi ) from the interplay between the spin--orbit interaction and Zeeman effect, which results in a finite supercurrent at \varphi =0 (anomalous Josephson current) and a direction-dependent critical current.
- 2013-05-15
著者
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Eto Mikio
Faculty Of Science And Technology Keio University
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Yokoyama Tomohiro
Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522
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Nazarov Yuli
Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
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