Evidence of anisotropic three-dimensional weak-localization in TiSe$_{2}$ nanoflakes

TL;DR

This paper reports the discovery of anisotropic three-dimensional weak localization effects in TiSe₂ nanoflakes, revealing unique phase-coherent transport properties distinct from other transition-metal dichalcogenides.

Contribution

It provides the first evidence of anisotropic 3D weak localization in TiSe₂ nanoflakes, expanding understanding of quantum transport in layered materials.

Findings

Observation of anisotropic negative magnetoresistance in TiSe₂ nanoflakes

Incompatibility with conventional 2D weak localization or Kondo effect explanations

Attribution of effects to three-dimensional weak localization

Abstract

TiSe$_2$ is a typical transition-metal dichalcogenide known for its charge-density wave order. In this study, we report the observation of an unusual anisotropic negative magnetoresistance in exfoliated TiSe$_2$ nanoflakes at low temperatures. Unlike the negative magnetoresistance reported in most other transition-metal dichalcogenides, our results cannot be explained by either the conventional two-dimensional weak localization effect or the Kondo effect. A comprehensive analysis of the data suggests that the observed anisotropic negative magnetoresistance in TiSe$_2$ flakes is most likely caused by the three-dimensional weak localization effect. Our findings contribute to a deeper understanding of the phase-coherent transport processes in TiSe$_2$.