Non-Coulomb strong electron-hole binding in Ta2NiSe5 revealed by time- and angle-resolved photoemission spectroscopy

doi:10.1103/PhysRevB.101.235148

	Non-Coulomb strong electron-hole binding in Ta2NiSe5 revealed by time- and angle-resolved photoemission spectroscopy
	Tang, Tianwei 1; Wang, Hongyuan2 ; Duan, Shafeng 1; Yang, Yuanyuan 1; Huang, Chaozhi 1; Guo, Yanfeng2 ; Qian, Dong 1; Zhang, Wentao 1
	2020-06-22
发表期刊	PHYSICAL REVIEW B (IF:3.2[JCR-2023],3.3[5-Year])
ISSN	2469-9950
EISSN	2469-9969
卷号	101 期号:23
发表状态	已发表
DOI	10.1103/PhysRevB.101.235148
摘要	We reveal an ultrafast purely electronic phase transition in Ta2NiSe5, which is a plausible excitonic insulator, after excited by an ultrafast infrared laser pulse. Specifically, the order parameter of the strong electron-hole binding shrinks with enhancing the pump pulse, and above a critical pump fluence, a photoexcited semimetallic state is experimentally identified with the absence of ultrafast structural transition. In addition, the bare valence and conduction bands and also the effective masses in Ta2NiSe5 are determined. These findings and detailed analysis suggest a bare nonequilibrium semimetallic phase in Ta2NiSe5 and the strong electron-hole binding cannot be exclusively driven by Coulomb interaction.
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收录类别	SCI ; SCIE ; EI
语种	英语
资助项目	Ministry of Science and Technology of China[2016YFA0301003][2016YFA0300501] ; National Natural Science Foundation of China[11874264][11674224][11974243][11704247][U1632272][11521404] ; Natural Science Foundation of Shanghai[17ZR1443300]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000541702100002
出版者	AMER PHYSICAL SOC
WOS关键词	PHASE
原始文献类型	Article
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/121860
专题	物质科学与技术学院_博士生物质科学与技术学院_PI研究组_郭艳峰组
通讯作者	Zhang, Wentao
作者单位	1.Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Artificial Struct & Quantum Control, Minist Educ,Shenyang Natl Lab Mat Sci, Shanghai 200240, Peoples R China 2.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China
推荐引用方式 GB/T 7714	Tang, Tianwei,Wang, Hongyuan,Duan, Shafeng,et al. Non-Coulomb strong electron-hole binding in Ta2NiSe5 revealed by time- and angle-resolved photoemission spectroscopy[J]. PHYSICAL REVIEW B,2020,101(23).
APA	Tang, Tianwei.,Wang, Hongyuan.,Duan, Shafeng.,Yang, Yuanyuan.,Huang, Chaozhi.,...&Zhang, Wentao.(2020).Non-Coulomb strong electron-hole binding in Ta2NiSe5 revealed by time- and angle-resolved photoemission spectroscopy.PHYSICAL REVIEW B,101(23).
MLA	Tang, Tianwei,et al."Non-Coulomb strong electron-hole binding in Ta2NiSe5 revealed by time- and angle-resolved photoemission spectroscopy".PHYSICAL REVIEW B 101.23(2020).