Quantum transport in oxide nanostructures

TL;DR

This paper investigates quantum transport phenomena in oxide nanostructures, revealing effects of spin-orbit coupling, valley degeneracies, and magnetic phases through magnetotransport experiments on LaAlO3/SrTiO3 interfaces.

Contribution

It provides new experimental insights into quantum transport in oxide nanostructures, highlighting the roles of spin-orbit coupling and magnetic phases in one-dimensional systems.

Findings

Observation of Shubnikov-de Haas oscillations with modulations indicating spin-orbit coupling or valley degeneracies.

Detection of dissipative coupling to magnetic phases in ultra-narrow Hall crosses.

Identification of non-monotonic dips in Hall resistance linked to one-dimensional confinement and spin-orbit effects.

Abstract

We describe magnetotransport experiments performed on Hall crosses made from quantum wires at LaAlO3/SrTiO3 interfaces. Shubnikov-de Haas oscillations measured in a 14-nm wide structure exhibit modulations that are consistent with spin-orbit coupling or valley degeneracies. Hall measurements performed on the 6 nm-wide Hall cross reveal dissipative coupling to magnetic phases. Hall plateaus are observed that deviate significantly from two-dimensional quantum Hall counterparts. Non-monotonic dips in the Hall resistance are attributed to one-dimensional confinement and spin-orbit coupling.