Room-temperature intrinsic nonlinear planar Hall effect in TaIrTe$_4$

TL;DR

This paper reports the discovery of a room-temperature intrinsic nonlinear planar Hall effect in TaIrTe$_4$, revealing a new intrinsic charge transport response linked to quantum geometry, with potential for nonlinear device applications.

Contribution

The study experimentally uncovers a novel intrinsic nonlinear planar Hall effect in TaIrTe$_4$, connecting it to Berry-connection polarizability and orbital mechanisms, and demonstrates its persistence at room temperature.

Findings

Intrinsic nonlinear planar Hall effect observed in TaIrTe$_4$

Effect persists up to room temperature

Theoretical calculations confirm experimental results

Abstract

Intrinsic responses are of paramount importance in physics research, as they represent the inherent properties of materials, independent of extrinsic factors that vary from sample to sample, and often reveal the intriguing quantum geometry of the band structure. Here, we report the experimental discovery of a new intrinsic response in charge transport, specifically the intrinsic nonlinear planar Hall effect (NPHE), in the topological semimetal TaIrTe$_4$. This effect is characterized by an induced Hall current that is quadratic in the driving electric field and linear in the in-plane magnetic field. The response coefficient is determined by the susceptibility tensor of Berry-connection polarizability dipole, which is an intrinsic band geometric quantity. Remarkably, the signal persists up to room temperature. Our theoretical calculations show excellent agreement with the experimental results and further elucidate the significance of a previously unknown orbital mechanism in intrinsic NPHE. This finding not only establishes a novel intrinsic material property but also opens a new route toward innovative nonlinear devices capable of operating at room temperature.