Spin-Orbit induced phase-shift in Bi2Se3 Josephson junctions

Abstract : The transmission of Cooper pairs between two weakly coupled superconductors produces a superfluid current and a phase difference; the celebrated Josephson effect. Because of time-reversal and parity symmetries, there is no Josephson current without a phase difference between two superconductors. Reciprocally, when those two symmetries are broken, an anomalous supercurrent can exist in the absence of phase bias or, equivalently, an anomalous phase shift φ 0 can exist in the absence of a superfluid current. We report on the observation of an anomalous phase shift φ 0 in hybrid Josephson junctions fabricated with the topological insulator Bi 2 Se 3 submitted to an in-plane magnetic field. This anomalous phase shift φ 0 is observed directly through measurements of the current-phase relationship in a Josephson interferometer. This result provides a direct measurement of the spin-orbit coupling strength and open new possibilities for phase-controlled Josephson devices made from materials with strong spin-orbit coupling.
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Alexandre Assouline, Chéryl Feuillet-Palma, Nicolas Bergeal, Tianzhen Zhang, Alireza Mottaghizadeh, et al.. Spin-Orbit induced phase-shift in Bi2Se3 Josephson junctions. Nature Communications, Nature Publishing Group, 2019, 10, pp.126. ⟨10.1038/s41467-018-08022-y⟩. ⟨hal-01983043⟩

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