Abstract
We study the structure of the ground-state wave function for a general model of a continuum polaron in d dimensions, coupled to either optical or acoustical phonons. Using a path-integral approach we derive a simple criterion which is sufficient to guarantee that the exact ground state is delocalized. This criterion applies to most polaron models studied so far and thus implies that interaction with phonons generally does not lead to a breaking of the translational symmetry, even for arbitrary strong coupling. We discuss briefly the distinction between self-trapping and localization.
Original language | English |
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Pages (from-to) | 5912-5915 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 34 |
Issue number | 8 |
DOIs | |
State | Published - 1986 |