Electrically modulated SQUID with a single Josephson junction coupled by a time reversal breaking Weyl semimetal thin film
Yong Xu, Salah Uddin, Jun Wang, Zhongshui Ma, Jun-Feng Liu
DOI 10.1103/PhysRevB.97.035427 · Physical Review B
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Abstract
Usually, the superconducting quantum interference device (SQUID) consists of two Josephson junctions, and the interference therein is modulated by a magnetic flux. In this paper, we propose an electrically modulated SQUID consisting of a single Josephson junction coupled by a time reversal breaking Weyl semimetal thin film. For a low Fermi energy, the Josephson current is only mediated by Fermi arc surface states and has an arbitrary ground-state phase difference φ0 which is directly proportional to the product of the transverse electric field and the cross section area of the junction. For a suitable Fermi energy, the bulk states make comparable contributions to the Josephson current with the current-phase relation of a 0 junction. The interference between the surface channel and the bulk channel results in an electrically modulated SQUID with single Josephson junction, which provides an experimental proposal to identify magnetic Weyl semimetals and may have potential applications in superconducting quantum computation.
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