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Anisotropic electron and lattice dynamics in excitonic insulator Ta2NiSe5

文献类型：期刊论文

作者Chu, Lingqiao2,3; Zhang, Kai2; Yang, Jin2; Jiang, Huachao2; Wang, Zhenyou1; Su, Fuhai2
刊名AIP ADVANCES
出版日期2022-05-01
卷号12
DOI10.1063/5.0086701
通讯作者Su, Fuhai(fhsu@issp.ac.cn)
英文摘要We employ polarization-resolved femtosecond optical pump-probe spectroscopy to investigate the nonequilibrium photocarrier dynamics in excitonic insulator Ta2NiSe5. The electronic dynamics, including hot carrier cooling, exciton formation, and recombination in the timescale ranging from subpicoseconds to a few tens of picoseconds, have been established from the transient reflectivity spectra, showing strong in-plane anisotropy with respect to the probe polarization. Such anisotropic photocarrier dynamics possibly arise from the crystalline orientation dependence of the excitonic polarizability. Furthermore, we find that the amplitude of coherent phonons with a frequency of 1 THz is subject to the probe polarization, whereas it is not sensitive to the pump polarization. This substantiates that the displacive excitation of coherent phonons plays a decisive role in lattice dynamics. In addition, we find that the photo-induced dielectric screening tends to suppress the amplitude of coherent phonons with increasing pump fluence, manifesting a remarkable polarization dependence. Our work provides valuable insights into the excitonic dynamics and the origin of coherent phonon generation and also may contribute to the development of polarization-sensitive photoelectric devices based on Ta2NiSe5. (C)& nbsp;2022 Author(s).
WOS关键词PHASE
资助项目National Natural Science Foundation of China[11774354] ; National Natural Science Foundation of China[12004387] ; National Natural Science Foundation of China[12174398] ; National Natural Science Foundation of China[51727806] ; Science Challenge Project[TZ2016001] ; CAS Innovation Grant[CXJJ-19-B08]
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Physics
语种英语
WOS记录号WOS:000797231900003
出版者AIP Publishing
资助机构National Natural Science Foundation of China ; Science Challenge Project ; CAS Innovation Grant
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/130921]  
专题中国科学院合肥物质科学研究院
通讯作者Su, Fuhai
作者单位1.Chinese Acad Sci, GBA Branch Aerosp Informat Res Inst, Guangzhou 510700, Peoples R China
2.Chinese Acad Sci, Inst Solid State Phys, HFIPS, Key Lab Mat Phys, Hefei 230031, Peoples R China
3.Anhui Univ, Inst Phys Sci & Informat Technol, Hefei 230601, Peoples R China
推荐引用方式
GB/T 7714		 Chu, Lingqiao,Zhang, Kai,Yang, Jin,et al. Anisotropic electron and lattice dynamics in excitonic insulator Ta2NiSe5[J]. AIP ADVANCES,2022,12.
APA Chu, Lingqiao,Zhang, Kai,Yang, Jin,Jiang, Huachao,Wang, Zhenyou,&Su, Fuhai.(2022).Anisotropic electron and lattice dynamics in excitonic insulator Ta2NiSe5.AIP ADVANCES,12.
MLA Chu, Lingqiao,et al."Anisotropic electron and lattice dynamics in excitonic insulator Ta2NiSe5".AIP ADVANCES 12(2022).

入库方式： OAI收割

来源：合肥物质科学研究院

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