Journal
PHYSICAL REVIEW B
Volume 101, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.235148
Keywords
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Funding
- Ministry of Science and Technology of China [2016YFA0301003, 2016YFA0300501]
- National Natural Science Foundation of China [11874264, 11674224, 11974243, 11704247, U1632272, 11521404]
- Shanghai talent program
- Natural Science Foundation of Shanghai [17ZR1443300]
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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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