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Pré-Publication, Document De Travail Année : 2018

Spin-Orbit induced phase-shift in Bi2Se3 Josephson junctions

Résumé

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 phi_0 can exist in the absence of a superfluid current. We report on the observation of an anomalous phase shift phi_0 in hybrid SNS Josephson junctions fabricated with the topological insulator Bi2Se3 submitted to an in-plane magnetic field. This anomalous phase shift phi_0 is observed directly through measurements of the current-phase relationship (CPR) in a Josephson Interferometer (JI). 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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Dates et versions

hal-01921955 , version 1 (14-11-2018)

Identifiants

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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. 2018. ⟨hal-01921955⟩
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