Photoinduced Interlayer Dynamics in T${}_d$-MoTe${}_2$: A Broadband Pump-Probe Study

Abstract

We report on time-resolved broadband transient reflectivity (tr-bb-TR) measurements performed on a bulk single crystal of T${}_d$-MoTe${}_2$ as a function of the incident pump fluence (F). Tr-bb-TR data unveil photoinduced electronic changes progressing on the sub-picosecond timescale as well as the dynamics of the coherent low-frequency ${}^1{A}_1$ interlayer shear phonon. Our results indicate a gradual evolution of both the TR and the ${}^1{A}_1$ Fourier intensity spectra as a function of F, ruling out the threshold-like change that has been associated with the ultrafast photoinduced $T_d\to 1T^{\prime }$ phase transition. We also observe a large redshift of the ${}^1{A}_1$ Fourier spectral features, which suggests that large renormalization effects are taking place on interband transitions that are dielectrically susceptible to the ${}^1{A}_1$ interlayer phonon displacement.

arXiv comment15 pages, 3 figures

References in corpus (15)

• Type-II Weyl Semimetals
• Topological Materials: Weyl Semimetals
• Evidence for a Structurally-driven Insulator-to-metal Transition in VO2: a View from the Ultrafast Timescale
• Observation of the Type-II Weyl Semimetal Phase in MoTe2
• Ultrafast changes in lattice symmetry probed by coherent phonons
• Engineering the structural and electronic phases of MoTe2 through W substitution
• Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe2
• Momentum-Resolved View of Electron-Phonon Coupling in Multilayer WSe${}_2$
• Light induced sub-picosecond topological phase transition in MoTe2
• Ultrafast Carrier Dynamics in the Large Magnetoresistance Material WTe${}_2$
• Polar and phase domain walls with conducting interfacial states in a Weyl semimetal MoTe2
• Dimensionality-driven orthorhombic MoTe2 at room temperature
• Enhanced ultrafast relaxation rate in the Weyl semimetal phase of $\mathbf{MoT}{\mathbf{e}}_2$ measured by time-and angle-resolved photoelectron spectroscopy
• Origin of magnetoresistance suppression in thin $\gamma$-MoTe${}_2$
• Low-energy excitations in type-II Weyl semimetal Td-MoTe2 evidenced through optical conductivity

Cited by in corpus (2)

• Traversing double-well potential energy surfaces: photoinduced concurrent intralayer and interlayer structural transitions in XTe2 (X=Mo, W)
• Ultrafast transport mediated homogenization of photoexcited electrons governs the softening of the $A_{1g}$ phonon in bismuth