Manipulating the Optical Response of TaIrTe4 Heterostructures through Band Alignment Strategy

Abstract

Weyl semimetals, such as $TaIrTe_{4}$, characterized by their unique band structures and exotic transport phenomena, have become a central focus in modern electronics. Despite extensive research, a systematic understanding of the impact of heterogeneous integration on the electronic and optical properties of TaIrTe4 device remains elusive. We have carried out density functional theory combined with nonequilibrium Green's function formalism calculations for $TaIrTe_{4}/WTe_{2}$, $TaIrTe_{4}/MoTe_{2}$ and $TaIrTe_{4}/h-BN$ heterostructures, aiming to understand the manipulation of photoresponse through various band alignment strategies. The underlying impacts of interlayer interactions, charge transfer and build-in electric field on the electronic properties are carefully investigated. We design a dual-probe photodetector device to understand the overall photoresponse enhancement of the heterogeneous integration by decomposing into the specific strain, interlayer transition, band overlap and symmetry lowering mechanics. These van der Waals integrations provide an ideal platform for studying band alignment physics in self-powered optoelectronic devices.