TY - JOUR
T1 - Photo-Induced Tellurium Segregation in MoTe2
AU - Fukuda, Takumi
AU - Kaburauchi, Ryota
AU - Saito, Yuta
AU - Makino, Kotaro
AU - Fons, Paul
AU - Ueno, Keiji
AU - Hase, Muneaki
N1 - Funding Information:
The authors are grateful for financial supports from the Murata Science Foundation, JSPS KAKENHI (Grant Numbers. 17H02908, 18H01822 and 19H02619), CREST, JST (Grant Number. JPMJCR1875), and JSPS Research Fellowships for Young Scientists, Japan. The authors gratefully acknowledge Prof. T. Sekiguchi (R&D Center for Innovative Material Characterization, University of Tsukuba) for supporting SEM‐EDX measurements.
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/9
Y1 - 2022/9
N2 - Herein, coherent phonon spectroscopy of polymorphic (Formula presented.) single crystals using a femtosecond-pulsed laser is used to investigate the relationship between structural phase transitions and photo-thermal effects induced by high-density laser excitation. Even when a femtosecond-pulsed laser is used, which generally induces fewer heat accumulation effects than the case for a continuous-wave (CW) laser, tellurium segregation is observed in coherent phonon spectra with increasing excitation density, while no structural phase transition among the polymorphs of (Formula presented.) is observed. The use of higher photon-energy excitation, however, is found to suppress tellurium segregation.
AB - Herein, coherent phonon spectroscopy of polymorphic (Formula presented.) single crystals using a femtosecond-pulsed laser is used to investigate the relationship between structural phase transitions and photo-thermal effects induced by high-density laser excitation. Even when a femtosecond-pulsed laser is used, which generally induces fewer heat accumulation effects than the case for a continuous-wave (CW) laser, tellurium segregation is observed in coherent phonon spectra with increasing excitation density, while no structural phase transition among the polymorphs of (Formula presented.) is observed. The use of higher photon-energy excitation, however, is found to suppress tellurium segregation.
KW - coherent phonon spectroscopy
KW - femtosecond lasers
KW - transition-metal dichalcogenides
UR - http://www.scopus.com/inward/record.url?scp=85131588274&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85131588274&partnerID=8YFLogxK
U2 - 10.1002/pssr.202100633
DO - 10.1002/pssr.202100633
M3 - Article
AN - SCOPUS:85131588274
SN - 1862-6254
JO - Physica Status Solidi - Rapid Research Letters
JF - Physica Status Solidi - Rapid Research Letters
ER -