Photo-induced Tellurium segregation in $\mathrm{MoT}{\mathrm{e}}_2$

Abstract

We report on the coherent phonon spectroscopy of polymorphic $\mathrm{MoT}{\mathrm{e}}_2$ single crystals using a femtosecond-pulsed laser to investigate the relationship between structural phase transitions and photo-thermal effects induced by high-density laser excitation. Even when a femtosecond pulsed laser was used, which generally induces fewer heat accumulation effects than the case for a CW laser, tellurium segregation was observed in coherent phonon spectra with increasing excitation density, while no structural phase transition among polymorphs of $\mathrm{MoT}{\mathrm{e}}_2$ was observed. The use of higher photon-energy excitation, however, was found to suppress tellurium segregation.

15 pages, 4 figures, accepted for Physica Status Solidi (RRL) - Rapid Research Letters

References in corpus (4)

• Activation of new Raman modes by inversion symmetry breaking in type II Weyl semimetal candidate T'-MoTe2
• Raman scattering in transition metal dichalcogenides MTe2 (M = Mo, W)
• Ultrafast dynamics of the low frequency shear mode in $1{\mathrm{T}}^{\prime }-\mathrm{MoT}{\mathrm{e}}_2$
• Investigation of laser-induced-metal phase of ${\mathrm{MoTe}}_2$ and its contact property via scanning gate microscopy

Cited by in corpus (3)

• Role of interlayer shear phonons on lattice symmetry switching in the transition metal dichalcogenide WTe${}_2$
• Nonequilibrium carrier and phonon dynamics in the ferrimagnetic semiconductor Mn${}_3$Si${}_2$Te${}_6$
• Coherent Spin-Phonon Coupling in the Layered Ferrimagnet Mn3Si2Te6