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- W3105979266 abstract "We consider a ground-state band insulator turning into a nonequilibrium excitonic insulator (NEQ-EI) upon visiting properly selected and physically relevant highly excited states. The NEQ-EI phase, characterized by self-sustained oscillations of the complex order parameter, neatly follows from a nonequilibrium Green's function treatment on the Konstantinov-Perel' contour. We present the first ab initio band structure of LiF, a ground-state bulk insulator, in different NEQ-EI states. We also show that NEQ-EI states can be generated by currently available pump pulses. Peculiar fingerprints of the NEQ-EI phase in time-resolved angle-resolved photoemission spectroscopy spectra are highlighted: (i) during the pump-driving, the system goes through a BEC-BCS crossover and (ii) concomitantly the excitonic spectral structure undergoes a convex-to-concave shape transition; (iii) attosecond pulses shone after the pump-driving at different times ${t}_{mathrm{delay}}$ produce a photocurrent that oscillates in ${t}_{mathrm{delay}}$ with a pump-tunable frequency---we relate this phenomenon to the ac response of an exotic Josephson junction." @default.
- W3105979266 created "2020-11-23" @default.
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- W3105979266 date "2019-12-16" @default.
- W3105979266 modified "2023-10-16" @default.
- W3105979266 title "Pump-driven normal-to-excitonic insulator transition: Josephson oscillations and signatures of BEC-BCS crossover in time-resolved ARPES" @default.
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- W3105979266 doi "https://doi.org/10.1103/physrevmaterials.3.124601" @default.
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