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Séminaire QUEST

Jeudi 29 septembre à 9h30,
Salle Rémy Lemaire, K223

Orateur : S. Guéron (LPS)
"Ballistic edge states in bismuth nanowires revealed by SQUID interferometery"

Abstract

Spin-orbit interactions are known to have drastic effects on the band structure of heavy-element-based materials. Celebrated examples are the recently identified 3D and 2D topological insulators, in which transport takes place through surface or edge states. In such edge states, spin-momentum locking provides protection against (non-magnetic) impurity scattering and favors spin-polarized ballistic transport.
By measuring the current-phase relation of a micrometer-long single-crystal bismuth nanowire connected to superconducting electrodes, we have shown that the supercurrent flowsballisticallyalong two edges. In addition, thanks to the extraordinarily large g-factor and spin orbit coupling in this system, we find that an external magnetic field can induce 0-pi transitions and phi0-junction behavior, providing a way to manipulate the phase of these supercurrent-carrying edge states.

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