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- W2551537662 abstract "Structural phase transitions and superfluidity of macroscopic and mesoscopic ensembles of optically excited indirect excitons in spatially separated electron-hole bilayers and coupled quantum dots are investigated with path integral Monte Carlo simulations. At small inter-layer separation distances and low temperatures the indirect excitons are stable complexes with a permanent dipole moment “d”. These excitons are treated as bosons with an effective pair interaction potential and bosonic exchange. We show that for d> 3a B the exciton-exciton repulsion is sufficient to stabilize the excitons into a crystalline state. We analyse in detail quantum melting of this bosonic solid and the onset of the superfluid exciton liquid phase. The temperature of appearance of the superfluidity (Kosterlitz-Thouless transition temperature) agrees with the theoretical estimates for electron-hole bilayers [1]. Quantitative predictions on the superfluid fraction are given for typical materials like ZnSe and GaAs quantum wells. In the present work we use quantum Monte Carlo simulations to give a first principle thermodynamic description of different phases which can be realized in a confined electron-hole system in a bilayer geometry." @default.
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- W2551537662 date "2008-01-01" @default.
- W2551537662 modified "2023-09-26" @default.
- W2551537662 title "Exciton crystallization and superfluidity in electron-hole bilayers and coupled quantum dots" @default.
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