Spin-Orbit induced phase-shift in Bi2Se3 Josephson junctions

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 the 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 Bi2Se3 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.

Reference :
Assouline, A. et al. Spin-Orbit induced phase-shift in Bi2Se3 Josephson junctions. Nat. Commun. 10, 126 (2019).
Contact : herve.aubin (arobase) c2n.upsaclay.fr OR alexandre.assouline (arobase) cea.fr
Site Web : http://qtg.lpem.espci.fr

Haut de page

À lire aussi...

Mapping and Quantifying Electric and Magnetic Dipole Luminescence at the Nanoscale

Usually, in fluorescence experiments, the emission of light often comes from electric dipole transitions. ESPCI researchers from LPEM & (...) 

> Lire la suite...

Quantum co-tunneling in nanoparticles arrays

H. Moreira1, Q. Yu1, B. Nadal1, B. Bresson1, M. Rosticher2, N. Lequeux1, A. Zimmers1 et H. Aubin1 (1) Laboratoire de Physique et d’Etude des (...) 

> Lire la suite...