Volume 126, Number 6, June 2019
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 July 2019|
Manipulating the anomalous Josephson effect by interface valley-polarized mixing
1 Department of Physics and Institute of Theoretical Physics, Nanjing Normal University - Nanjing, China
2 Department of Physics, Southeast University - Nanjing 210096, China
Received: 4 April 2019
Accepted: 17 June 2019
We theoretically investigate the supercurrent through a Josephson junction with at least one superconducting electrode directly coupled to a valley-polarized graphene sheet. The anomalous Josephson effect is shown and remarkably manipulated by interface valley-polarized mixing together with combination of the static staggered potentials and off-resonant circularly polarized light field inducing the valley polarization. The unconventional Josephson effect results from the breaking of underlying chiral (polarized-valley rotational) and time-reversal symmetries, which in turn shows the equivalence of the valley and spin freedoms. The valley-polarized interface-tunable phase offset will be of great interest in the designing and fabrication of such novel devices based on valleytronics as superconducting flux- and phase-based quantum bits, phase batteries and rectifiers.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 73.23.-b – Electronic transport in mesoscopic systems / 74.50.+r – Tunneling phenomena; Josephson effects
© EPLA, 2019
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