laboratoire pierre aigrain
électronique et photonique quantiques
laboratoire pierre aigrain

Séminaire, 1 Juin 2015

Sophie GUERON, Laboratoire de Physique des Solides - Université Paris Sud - ORSAY
Field-resistant quantum interference in bismuth nanowire-based Josephson junctions

Chuan Li1, A. Kasumov1 ;5, A. Murani1, Shamashis Sengupta2, F. Fortuna2, K. Napolskii3 ;4, D. Koshkodaev
4, G. Tsirlina3, Y. Kasumov5, I. Khodos5, R. Deblock1, M. Ferrier1, S. Gueron1 and H. Bouchiat1

1 LPS, Univ. Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France
2 CSNSM, Univ. Paris-Sud, IN2P3, UMR 8609, F-91405 Orsay Cedex, France
3 Faculty of Chemistry, Moscow State University, Russia
4 Department of Material Sciences, Moscow State University, Russia
5 Institute of Microelectronics Technology and High Purity Materials, Chernogolovka, Russia

I will present our work on the superconducting proximity effect induced in crystalline bismuth nanowires, a system with extremely high Rashba spin-orbit coupling. By connecting these nanowires to superconducting electrodes with very high critical field, we have explored the proximity effect over a broad magnetic field range, up to a regime in which the Zeeman energy reaches the spin-orbit and Fermi energies of the Bismuth wires.
I will go into some detail about the complex interference pattern displayed by the critical current as a function of magnetic field. I will argue that it is due to both spin and orbital degrees of freedom, and is the tell-tale sign of low dimensionality, phase coherent conduction regions interfering within the nanowires.

Ref : Phys. Rev. B 90, 245427 (2014)