Three-dimensional topological semimetals like type-II Weyl semimetal transition metal dichalcogenides $(T_d{\text{-WTe}}_2 \text{and} {\mathrm{MoTe}}_2)$ exhibit intriguing phenomena associated with various symmetries governing their band structure. Density functional theory-based band structure calculations and angle-resolved photoemission spectroscopy studies on $T_d{\text{-WTe}}_2$ have showcased the temperature-dependent variation of chemical potential and Fermi surface modifications. In this work, the decisive role of the complex band dispersion and Fermi surface topology changes (FSTCs) of ${\mathrm{WTe}}_2$ in modulating the scattering channels for charge carriers has been studied using low-frequency resistance noise spectroscopy, a transport-based probe extremely sensitive to disorder dynamics and charge carrier interference. A nonmonotonic dependence of noise with temperature is observed, with noise peaks close to temperatures associated with FSTCs in $T_d{\text{-WTe}}_2$ due to disappearance of specific carrier pockets in the Fermi surface. The time reversal symmetry in the spin-textured band structure of ${\mathrm{WTe}}_2$ is broken in a finite magnetic field leading to the emergence of additional scattering channels for the charge carriers that influence the resistance noise and the scattering timescales.

Close

PrevNext

View figure in article

• Magnetotransport
• Noise
• Weyl semimetal