# Current-Induced Torques with Dresselhaus Symmetry Due to Resistance Anisotropy in 2D Materials

## TL;DR

This paper investigates current-induced torques in heterostructures of Permalloy and TaTe2, revealing a Dresselhaus symmetry component caused by resistance anisotropy-induced transverse currents, not spin-orbit effects.

## Contribution

It identifies resistance anisotropy as the source of Dresselhaus symmetry torques in heterostructures, highlighting a mechanism involving transverse currents due to resistance differences.

## Key findings

- Detection of Dresselhaus symmetry torque component.
- Transverse current caused by resistance anisotropy explains the torque.
- Implication for measurements in heterostructures with 2D materials.

## Abstract

We report measurements of current-induced torques in heterostructures of Permalloy (Py) with TaTe$_2$, a transition-metal dichalcogenide (TMD) material possessing low crystal symmetry, and observe a torque component with Dresselhaus symmetry. We suggest that the dominant mechanism for this Dresselhaus component is not a spin-orbit torque, but rather the Oersted field arising from a component of current that flows perpendicular to the applied voltage due to resistance anisotropy within the TaTe$_2$. This type of transverse current is not present in wires made from a single uniform layer of a material with resistance anisotropy, but will result whenever a material with resistance anisotropy is integrated into a heterostructure with materials having different resistivities, thereby producing a spatially non-uniform pattern of current flow. This effect will therefore influence measurements in a wide variety of heterostructures incorporating 2D TMD materials and other materials with low crystal symmetries.