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- W1968791388 abstract "We perform a critical analysis of the concept of phonon-induced phase transitions in connection with (Wannier) exciton-phonon systems. Particular attention is paid to the frequently discussed phenomena of self-trapping and overscreening. We demonstrate for a large class of (generalized Frohlich) models that a phase-transition-like behavior can be excluded: The ground-state energy, ground-state wave function, and the formal free energy are smooth functions of the electron-phonon and electron-hole coupling parameters. Analogous results hold for a magnetoexciton-phonon system, moving unrestricted or, e.g., within a quantum well. Our proof makes use of functional-analytic and functional-integral methods, which have been successfully applied in previous studies of polaron systems." @default.
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- W1968791388 date "1990-08-15" @default.
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- W1968791388 title "Analytical properties of a (Wannier) exciton-phonon system: On the exclusion of self-trapping and overscreening" @default.
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- W1968791388 doi "https://doi.org/10.1103/physrevb.42.3537" @default.
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