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- W3181876357 abstract "Excitons, quasiparticles of electrons and holes bound by Coulombic attraction, are created transiently by light and play an important role in optoelectronics, photovoltaics and photosynthesis. While they are also predicted to form spontaneously in a small gap semiconductor or a semimetal, leading to a Bose-Einstein condensate at low temperature, their material realization has been elusive without any direct evidence. Here we detect the direct photoemission signal from spontaneously formed excitons in a debated excitonic insulator candidate Ta2NiSe5. Our symmetry-selective angle-resolved photoemission spectroscopy reveals a characteristic excitonic feature above the transition temperature, which provides detailed properties of excitons such as anisotropic Bohr radius. The present result evidences so called preformed excitons and guarantees the excitonic insulator nature of Ta2NiSe5 at low temperature. Direct photoemission can be an important tool to characterize steady-state excitons." @default.
- W3181876357 created "2021-07-19" @default.
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- W3181876357 date "2021-07-15" @default.
- W3181876357 modified "2023-09-24" @default.
- W3181876357 title "Detecting photoelectrons from spontaneously formed excitons" @default.
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- W3181876357 doi "https://doi.org/10.1038/s41567-021-01289-x" @default.
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