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arXiv · 2004.03713

Resonant Tunneling Anisotropic Magnetoresistance Induced by Magnetic Proximity

Chenghao Shen·Timothy Leeney·Alex Matos-Abiague·Benedikt Scharf·Jong E. Han·Igor Zutic
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Abstract

We reveal that the interplay between Rashba spin-orbit coupling and proximity-induced magnetization in a two-dimensional electron gas leads to peculiar transport properties and large anisotropy of magnetoresistance. While the related tunneling anisotropic magnetoresistance (TAMR) has been extensively studied before, we predict an effect with a different origin arising from the evolution of a resonant condition with the in-plane rotation of magnetization and having a much larger magnitude. The resonances in the tunneling emerge from a spin-parity-time symmetry of the scattering states. However, such a symmetry is generally absent from the system itself and only appears for certain parameter values. Without resonant behavior in the topological surface states of a proximitized three-dimensional topological insulator (TI), TAMR measurements can readily distinguish them from often misinterpreted trivial Rashba-like states inherent to many TIs.

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Chenghao Shen, Timothy Leeney, Alex Matos-Abiague, Benedikt Scharf, Jong E. Han, Igor Zutic. 2020-04-03. Resonant Tunneling Anisotropic Magnetoresistance Induced by Magnetic Proximity. https://doi.org/10.1103/physrevb.102.045312

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