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Nano Research 2021, 14(4): 1162-1166 https://doi.org/10.1007/s12274-020-3166-1
Research Article | Issue | Published: 30 October 2020

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

Show Author's Information 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
Keywords:
charge density wave 1T-TaS2, layer-dependent, phase transition stiffness, ultrafast carrier dynamics
Topics:
Excited states Spectroscopic analysisStiffness
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
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Abstract Full text Electronic supplementary material About this article

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.


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Electronic supplementary material
About this article

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

Show Author's information 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

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-TaS2, layer-dependent, phase transition stiffness, ultrafast carrier dynamics

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Publication history
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Acknowledgements

Publication history

Received: 01 September 2020
Revised: 30 September 2020
Accepted: 08 October 2020
Published: 30 October 2020
Issue date: April 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

We thank Prof. Yong Wang (Nankai University) for the valued discussions. We acknowledge financial support from the National Key Research and Development Program of China (Nos. 2017YFA0205000, 2017YFA0303600, and 2016YFA0200701), the National Natural Science Foundation of China (Nos. 21425310, 21790353, 21721002, 21822502, and 21673058), Strategic Priority Research Program of Chinese Academy of Sciences (Nos. XDB36000000 and XDB30000000) and the Key Research Program of Frontier Sciences of CAS (No. QYZDB-SSW-SYS031).

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