Magnetotransport and spin dynamics in an electron gas formed at oxide interfaces

TL;DR

This paper explores how magnetic and electric properties of oxide interfaces influence spin-dependent transport in a two-dimensional electron gas, revealing electric field control over spin and charge Hall effects.

Contribution

It introduces a comprehensive analysis of magnetotransport considering various oxide magnetic orders, highlighting electric field tunability of spin-orbit interactions and Hall conductance.

Findings

Electric field controls spin-orbit coupling in spiral multiferroic oxides.

Interplay of spin-orbit coupling, exchange field, and magnetic field affects conductance.

Gate-controlled spin and charge Hall effects observed.

Abstract

We investigate the spin-dependent transport properties of a two-dimensional electron gas formed at oxides' interface in the presence of a magnetic field. We consider several scenarios for the oxides' properties, including oxides with co-linear or spiral magnetic and ferroelectric order. For spiral multiferroic oxides, the magnetoelectric coupling and the topology of the localized magnetic moments introduce additional, electric field controlled spin-orbit coupling that affects the magneto-oscillation of the current. An interplay of this spin-orbit coupling, the exchange field, and of the applied magnetic field results in a quantum, gate-controlled spin and charge Hall conductance.