Interplay of Rashba, Zeeman and Landau splitting in a magnetic two dimensional electron gas

TL;DR

This study investigates the transport properties of a magnetic two-dimensional electron gas, revealing that Rashba spin-orbit splitting can dominate over Zeeman splitting in a HgMnTe quantum well, with implications for spintronic applications.

Contribution

The paper experimentally separates Rashba and Zeeman splittings in a magnetic 2DEG, demonstrating the dominance of Rashba splitting over Zeeman effects at moderate magnetic fields.

Findings

Rashba spin-orbit splitting exceeds or is comparable to Zeeman splitting.

Gate voltage can tune Rashba splitting.

Zeeman splitting depends on temperature.

Abstract

The transport properties of a magnetic two dimensional electron gas consisting of a modulation doped n type HgMnTe/HgCdTe quantum well, QW, have been investigated. By analyzing the Shubnikov-de Haas oscillations and the node positions of their beating patterns, we have been able to separate the gate voltage dependent Rashba spin-orbit splitting from the temperature dependent giant Zeeman splitting. It has been experimentally demonstrated that the Rashba spin-orbit splitting is larger than or comparable to the $sp-d$ exchange interaction induced giant Zeeman splitting in this magnetic 2DEG even at moderately high magnetic fields.