Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity

Abstract

Molybdenum ditelluride, MoTe2, is a versatile material where the topological phase can be readily tuned by manipulating the associated structural phase transition. The fine details of the band structure of MoTe2, key to understanding its topological properties, have proven difficult to disentangle experientially due to the multi-band character of the material. Through experimental optical conductivity spectra, we detect two strong low-energy interband transitions. Both are linked to excitations between spin-orbit split bands. The lowest interband transition shows a strong thermal shift, pointing to a chemical potential that dramatically decreases with temperature. With the help of ab initio calculations and a simple two-band model, we give qualitative and quantitative explanation of the main features in the temperature-dependent optical spectra up to 400 meV.

References in corpus (7)

• Universal dynamical conductance in graphite
• Field-Effect Transistors Based on Few-Layered alpha-MoTe_2
• Use of X-ray scattering functions in Kramers-Kronig analysis of reflectance
• Raman scattering in transition metal dichalcogenides MTe2 (M = Mo, W)
• Hall-effect within the colossal magnetoresistive semi-metallic state of MoTe2
• Enhanced ultrafast relaxation rate in the Weyl semimetal phase of $\mathbf{MoT}{\mathbf{e}}_2$ measured by time-and angle-resolved photoelectron spectroscopy
• Observation of spin-polarized bands and domain-dependent Fermi arcs in polar Weyl semimetal MoTe${}_2$

Cited by in corpus (10)

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• Optical conductivity signatures of open Dirac nodal lines
• Optical conductivity of the type-II Weyl semimetal TaIrTe${}_4$
• Evidence of 3D Dirac conical bands in TlBiSSe by optical and magneto-optical spectroscopy
• Signatures of van Hove singularities in the anisotropic in-plane optical conductivity of the topological semimetal Nb${}_3$SiTe${}_6$
• Optical conductivity of the type-II Weyl semimetal WTe${}_2$ under pressure
• Photoinduced Interlayer Dynamics in T${}_d$-MoTe${}_2$: A Broadband Pump-Probe Study
• Highly anisotropic Drude-weight-reduction and enhanced linear-dichroism in van der Waals Weyl semimetal Td-MoTe2 with coherent interlayer electronic transport