Optical conductivity of the type-II Weyl semimetal WTe${}_2$ under pressure

Abstract

Tungsten ditelluride WTe${}_2$ is a type-II Weyl semimetal with electronic properties highly sensitive to external pressure, as demonstrated by the superconductivity emerging under pressure. Here, we study the optical conductivity of the type-II Weyl semimetal WTe${}_2$ under external pressure at room temperature. With increasing pressure, a pronounced spectral weight transfer occurs from the high-energy to the low-energy interband transitions, with drastic changes in the profile of the optical conductivity spectrum indicating a high sensitivity of the electronic band structure to external pressure. The detailed analysis of the pressure-dependent optical conductivity furthermore reveals anomalies at the pressures $\sim$2 and $\sim$4.5~GPa, where an electronic and a structural phase transition, respectively, were reported in the literature.

10 pages, 6 figures

References in corpus (16)

• Titanic Magnetoresistance in WTe2
• Electronic structure basis for the titanic magnetoresistance in WTe${}_2$
• Quantum oscillations, thermoelectric coefficients and the Fermi surface of semi-metallic WTe2
• Chiral anomaly and optical absorption in Weyl semimetals
• Use of X-ray scattering functions in Kramers-Kronig analysis of reflectance
• Perfect charge compensation in WTe2 for the extraordinary magnetoresistance: From bulk to monolayer
• Nonlinear magnetotransport shaped by Fermi surface topology and convexity in WTe2
• Pressure-induced deconfinement of the charge transport in the quasi-one-dimensional Mott insulator (TMTTF)_2AsF_6
• Direct evidence for charge compensation induced large magnetoresistance in thin WTe2
• Electrodynamic response of type II Weyl semimetals
• Electronic properties of type-II Weyl semimetal WTe${}_2$. A review perspective
• Thermopower and Unconventional Nernst in the Predicted Type-II Weyl Semi-metal WTe${}_2$
• Damping of Confined Modes in a Ferromagnetic Thin Insulating Film: Angular Momentum Transfer Across a Nanoscale Field-defined Interface
• Nearly isotropic superconductivity in layered Weyl semimetal WTe${}_2$ at 98.5 kbar
• Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity
• Correlation of Crystal Quality and Extreme Magnetoresistance of WTe${}_2$