Year: 2021
Type: article
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 $\mathrm{Ta}\mathrm{Pt}{\mathrm{Te}}_{5}$ single crystals, which possess a layered crystal structure with quasi-1D $\mathrm{Pt}{\mathrm{Te}}_{2}$ chains. $\mathrm{Ta}\mathrm{Pt}{\mathrm{Te}}_{5}$ 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 $\mathrm{Ta}\mathrm{Pt}{\mathrm{Te}}_{5}$, which is further corroborated by the first-principles calculations. Our results suggest that $\mathrm{Ta}\mathrm{Pt}{\mathrm{Te}}_{5}$, in analogy with its sister compounds $\mathrm{Ta}\mathrm{Pd}{\mathrm{Te}}_{5}$ and $\mathrm{Ta}\mathrm{Ni}{\mathrm{Te}}_{5}$, is another quasi-1D material hosting topological Dirac fermions.
Institutions: Zhejiang University of Science and Technology, Chinese Academy of Sciences, Ningbo Institute of Industrial Technology, Nanjing University of Posts and Telecommunications, National Laboratory of Solid State Microstructures, Nanjing University, Southeast University, Zhejiang University of Technology, State Key Laboratory of Silicon Materials, Zhejiang University, Suzhou University of Technology, Northwest University, Michigan State University, University of Chinese Academy of Sciences
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3143703767