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Research Article

Layer-dependent charge density wave phase transition stiffness in 1T-TaS2 nanoflakes evidenced by ultrafast carrier dynamics

Rui Wang1( ), Junbo Zhou1,4, Xinsheng Wang1, Liming Xie1,4( ), Jimin Zhao2,3,4( ), Xiaohui Qiu1,4( )
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
Songshan Lake Materials Laboratory, Dongguan 523808, China
University of Chinese Academy of Sciences, Beijing 100049, China
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Abstract

Novel physical properties emerge when the thickness of charge density wave (CDW) materials is reduced to the atomic level, owing to the significant modification of the electronic band structure and correlation effects. Here, we investigate the layer-dependent CDW phase transition and evolution of the nonequilibrium state of 1T-TaS2 nanoflakes using pump-probe spectroscopy. Both the low-energy single-particle and collective excitation relaxations exhibit sharp changes at ~ 210 K, indicating a phase transition from commensurate CDW to nearly commensurate CDW state. The single particle process reveals that the phase transition stiffness (PTS) is thickness-dependent. Moreover, a small PTS is observed in thin nanoflakes, which is attributed to the reduced thickness that increases the fluctuation and inhibits the nucleation and growth of discommensurations. In addition, the phase mode vanishes when the discommensuration network appears. Our results suggest that the carrier dynamics could be an efficient operational approach to measuring the quantum phase transition in correlated materials.

Keywords

charge density wave 1T-TaS2layer-dependentphase transition stiffnessultrafast carrier dynamics

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Nano Research
Volume 14 Issue 4,
April 2021
Pages 1162-1166
DOI: 10.1007/s12274-020-3166-1
Cite this article:
Wang R, Zhou J, Wang X, et al. Layer-dependent charge density wave phase transition stiffness in 1T-TaS2 nanoflakes evidenced by ultrafast carrier dynamics. Nano Research, 2021, 14(4): 1162-1166. https://doi.org/10.1007/s12274-020-3166-1
Topics:
Excited states Spectroscopic analysisStiffness

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Received: 01 September 2020
Revised: 30 September 2020
Accepted: 08 October 2020
Published: 30 October 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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