# Enhanced ultrafast relaxation rate in the Weyl semimetal phase of MoTe2 measured by time- and angle-resolved photoelectron spectroscopy

@article{Crepaldi2017EnhancedUR,
title={Enhanced ultrafast relaxation rate in the Weyl semimetal phase of MoTe2 measured by time- and angle-resolved photoelectron spectroscopy},
author={Alberto Crepaldi and Gabriel Aut{\e}s and G. Gatti and Silvan Roth and Andrea Sterzi and Giulia Manzoni and Michele Zacchigna and Cephise Cacho and Richard T. Chapman and Emma Springate and Elaine A. Seddon and Philippe Bugnon and Arnaud Magrez and Helmuth Berger and Ivana Vobornik and M. Kallane and A. Quer and Kai Rossnagel and Fulvio Parmigiani and Oleg V. Yazyev and M. Grioni},
journal={Physical Review B},
year={2017},
volume={96},
pages={241408}
}`
• Published 28 September 2017
• Materials Science, Physics
• Physical Review B
$\mathrm{MoTe_2}$ has recently been shown to realize in its low-temperature phase the type-II Weyl semimetal (WSM). We investigated by time- and angle- resolved photoelectron spectroscopy (tr-ARPES) the possible influence of the Weyl points in the electron dynamics above the Fermi level $\mathrm{E_F}$, by comparing the ultrafast response of $\mathrm{MoTe_2}$ in the trivial and topological phases. In the low-temperature WSM phase, we report an enhanced relaxation rate of electrons optically…

## Figures from this paper

### Mode-resolved reciprocal space mapping of electron-phonon interaction in the Weyl semimetal candidate Td-WTe2

• Physics
Nature Communications
• 2020
The comparison with higher-frequency coherent phonon modes finally proves the shear mode-selectivity of the observed changes in the electronic structure, and reveals direct experimental insights into electronic processes that are of vital importance for a coherent phonons-induced topological phase transition in Td-WTe2.

### Engineering Weyl Phases and Nonlinear Hall Effects in T_{d}-MoTe_{2}.

• Physics
Physical review letters
• 2020
By studying the role of dimensionality, this work identifies a configuration in which a nonlinear surface response current emerges and reports the existence of a tunable nonlinear Hall effect in T_{d}-MoTe_{2} and proposes the use of this effect as a probe for the detection of polarity orientation in polar (semi)metals.

### Ultrafast dynamical Lifshitz transition

• Physics
• 2021
This work demonstate a non-equilibrium route for ultrafast modification of Fermi surface topology in quantum materials and demonstrates that this nonequilibrium topological electronic transition finds its microscopic origin in the dynamical modification of the effective electronic correlations.

### Spin, time, and angle resolved photoemission spectroscopy on WTe2

• Physics
Physical Review Research
• 2020
We combined a spin-resolved photoemission spectrometer with a high-harmonic generation (HHG) laser source in order to perform spin-, time- and angle-resolved photoemission spectroscopy (STARPES)

### Ultrafast dynamics of the low frequency shear phonon in 1T′- MoTe 2

• Physics
• 2020
We report on the dynamics of coherent phonons in semimetal 1T'-MoTe2 using femtosecond pump-probe spectroscopy. On an ultrafast sub-picosecond time scale at room temperature, a low frequency and

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

• Physics
Physical Review Materials
• 2020
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

### Symmetry-breaking and spin-blockage effects on carrier dynamics in single-layer tungsten diselenide

• Physics
• 2019
Understanding carrier creation and evolution in materials initiated by pulsed optical excitation is central to developing ultrafast optoelectronics. We demonstrate herein that the dynamic response of

### Spin-Resolved Electronic Response to the Phase Transition in MoTe_{2}.

• Physics, Materials Science
Physical review letters
• 2018
The results indicate that a new form of polar instability exists near the surface when the bulk is largely in a centrosymmetric phase.

### Impact of domain disorder on optoelectronic properties of layered semimetal MoTe2

• Materials Science, Chemistry
2D Materials
• 2021
We address the impact of crystal phase disorder on the generation of helicity-dependent photocurrents in layered MoTe2, which is one of the van der Waals materials to realize the topological type-II

### Direct Observation at Room Temperature of the Orthorhombic Weyl Semimetal Phase in Thin Epitaxial MoTe2

• Materials Science
• 2018
The direct observation at room temperature (RT) of the noncentrosymmetric orthorhombic topological Weyl semimetal phase in epitaxial thin films of MoTe2 grown on InAs(111)/Si(111) substrates by

## References

SHOWING 1-10 OF 10 REFERENCES

• 495
• 2015

### and E

• F. W. Jr., J. Chem. Thermodynamics 24, 627
• 1992

• 268
• 1966

### Phys

• Rev. B 92, 161107
• 2015

### Phys

• Rev. Lett. 117, 066402
• 2016

• 11, L103
• 1978

### Phys

• Rev. Lett. 117
• 2016