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- W4207013423 endingPage "100604" @default.
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- W4207013423 abstract "Excitons as composite bosons have been predicted to condense into Bose Einstein Condensation (BEC), Berezinskii-Kosterlitz-Thouless (BKT) superfluid or electron-hole liquid (EHL) states. However, short lifetime and small binding energy are the main obstacles that hinder the formation and observation of excitonic condensate at high temperature. Here we demonstrate excellent two-dimensional Tetrel Metal Halides (TMHs) platforms for excitonic quantum phase transition researches. We find that excitons in those monolayers possess effective masses similar to the free electron, promising large thermal de Broglie wavelengths. They can maintain stable bosonic characteristic at high temperature and concentration up to 10 12 cm −2 . The calculation on PbI 2 , PbBr 2 , PbCl 2 , SnI 2 , SnBr 2 , SnCl 2 indicates BEC transition temperatures at 49 K, 103 K, 252 K, 36 K, 78 K, 152 K, comparable to the experimentally observed exciton BEC in MoSe 2 –WSe 2 bilayer and 1 T-TiSe 2 at 100 K and 190 K respectively. Besides, we confirm that the thermal equilibrium of excitonic subsystem can be established really fast, up to ∼10–100 fs. The excitons can live for ∼1–100 μs without direct radiation, beneficial for the formation and observation of condensate state. Our result paves the way not only for studies of quantum phase transition researches, but also for high-temperature excitonic devices. • Room-temperature stable excitons in monolayer TMH materials. • Optical properties of monolayer TMH materials including exciton effect. • Prediction of the BEC and superfluid phase transitions. • Analysis of the exciton dynamic processes in monolayer TMH materials." @default.
- W4207013423 created "2022-01-26" @default.
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- W4207013423 date "2022-01-01" @default.
- W4207013423 modified "2023-10-01" @default.
- W4207013423 title "Towards high-temperature electron-hole condensate phases in monolayer tetrels metal halides: Ultra-long excitonic lifetimes, phase diagram and exciton dynamics" @default.
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- W4207013423 doi "https://doi.org/10.1016/j.mtphys.2022.100604" @default.
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