Anisotropic transport and de Haas$-$van Alphen oscillations in quasi-one-dimensional TaPtTe$_5$

TL;DR

This study investigates the anisotropic electronic transport and quantum oscillations in the quasi-one-dimensional material TaPtTe$_5$, revealing nontrivial topological properties and Dirac fermions through experimental and theoretical analysis.

Contribution

It reports the first observation of anisotropic magnetoresistance, Hall effect, and de Haas–van Alphen oscillations in TaPtTe$_5$, demonstrating its nontrivial band topology and quasi-1D topological Dirac fermions.

Findings

Observation of anisotropic magnetoresistance and nonlinear Hall effect.

Detection of two main dHvA oscillation frequencies indicating nontrivial topology.

First-principles calculations support the existence of topological Dirac fermions.

Abstract

Because of the unique physical properties and potential applications, the exploration of quantum materials with diverse symmetry-protected topological states has attracted considerable interest in the condensed-matter community in recent years. Most of the topologically nontirvial materials identified thus far have two-dimensional or three-dimensional structural characteristics, while the quasi-one-dimensional (quasi-1D) analogs are rare. Here we report on anisotropic magnetoresistance, Hall effect, and quantum de Haas$-$van Alphen (dHvA) oscillations in TaPtTe$_5$ single crystals, which possess a layered crystal structure with quasi-1D PtTe$_2$ chains. TaPtTe$_5$ manifests an anisotropic magnetoresistance and a nonlinear Hall effect at low temperatures. The analysis of the dHvA oscillations reveals two major oscillation frequencies (63.5 T and 95.2 T). The corresponding light effective masses and the nonzero Berry phases suggest the nontrivial band topology in TaPtTe$_5$, which is further corroborated by the first-principles calculations. Our results suggest that TaPtTe$_5$, in analogy with its sister compounds TaPdTe$_5$ and TaNiTe$_5$, is another quasi-1D material hosting topological Dirac fermions.