Electric field tunable non-linear Hall terahertz detector in Dual quantum spin Hall insulator $\text{TaIrTe}_4$

TL;DR

This paper proposes a method to achieve a switchable and robust Berry curvature dipole in dual quantum spin Hall insulator TaIrTe4 using electric fields, enabling potential applications in terahertz detection.

Contribution

It introduces a novel approach to control Berry curvature dipole in dual QSHIs, facilitating the design of nonlinear Hall effect-based terahertz detectors.

Findings

Switchable Berry curvature dipole in TaIrTe4 under electric fields.

Topological phase transitions influence the Berry curvature dipole.

Potential for designing tunable terahertz radiation detectors.

Abstract

Nonlinear Hall effect (NHE) can be generated via Berry curvature dipole (BCD) on nonequilibrium Fermi surface in a non-magnetic system without inversion symmetry.To achieve a large BCD, strong local Berry curvatures and their variation with respect to momentum are necessary and hence topological materials with strong inter-band coupling emerge as promising candidates. In this study, we propose a switchable and robust BCD in the newlydiscovered dual quantum spin Hall insulator (QSHI) $\text{TaIrTe}_4$ by applying out-of-plane electric fields. Switchable BCD could be found along with topological phase transitions or insulator-metal transition in the primitive cell and CDW phases of $\text{TaIrTe}_4$ monolayer. This work presents an instructive strategy for achieving a switchable and robust BCD within dual QSHIs, which should be helpful for designing the NHE-based THz radiations detector.