Photoexcitation Induced Quantum Dynamics of Charge Density Wave and Emergence of a Collective Mode in 1-TaS.

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ID: 29248
2019
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Abstract
Photoexcitation is a powerful means in distinguishing different interactions and manipulating the states of matter, especially in charge density wave (CDW) materials. The CDW state of 1-TaS has been widely studied experimentally mainly because of its intriguing laser-induced ultrafast responses of electronic and lattice subsystems. However, the microscopic atomic dynamics and underlying electronic mechanism upon photoexcitation remain unclear. Here, we demonstrate photoexcitation induced ultrafast dynamics of CDW in 1-TaS using time-dependent density functional theory molecular dynamics. We discover a novel collective oscillation mode between the CDW state and a transient state induced by photodoping, which is significantly different from thermally induced phonon mode and attributed to the modification of the potential energy surface from laser excitation. In addition, our finding validates nonthermal melting of CDW induced at low light intensities, supporting that conventional hot electron model is inadequate to explain photoinduced dynamics. Our results provide a deep insight into the coherent electron and lattice quantum dynamics during the formation and excitation of CDW in 1-TaS.
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zhang2019photoexcitationnano Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Zhang, Jin;Lian, Chao;Guan, Mengxue;Ma, Wei;Fu, Huixia;Guo, Haizhong;Meng, Sheng;
Journal Nano letters
Year 2019
DOI
10.1021/acs.nanolett.9b01865
URL
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