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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 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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https://hal.sorbonne-universite.fr/hal-01921955
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Submitted on : Wednesday, November 14, 2018 - 11:12:33 AM
Last modification on : Monday, September 13, 2021 - 4:49:19 PM
Long-term archiving on: : Friday, February 15, 2019 - 1:06:21 PM

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  • HAL Id : hal-01921955, version 1
  • ARXIV : 1806.01406

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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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