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Equivalence of two approaches to bipolarons in the strong-coupling limit

Smondyrev, J. T. Devreese

Published Jan 1, 1995• 0 citations
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A variational calculation is presented for large bipolarons in the strong-coupling limit. By means of the phonon coherent state, two coupled self-consistent integrodifferential equations for the center-of-mass and relative motions have been derived. Compared with previous works, lower binding energies for large bipolarons in three dimensions (3D) and two dimensions (2D) have been calculated. As a result, the values of lower bounds to critical ratios between dielectric constants below which bipolarons can exist are obtained as ${\mathrm{\ensuremath{\eta}}}_{\mathit{c}}$=1.23 in 3D and ${\mathrm{\ensuremath{\eta}}}_{\mathit{c}}$=1.64 in 2D.

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Introduction to the Theory of a Large Bipolaron

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A variational calculation is presented for large bipolarons in the strong-coupling limit. By means of the phonon coherent state, two coupled self-consistent integrodifferential equations for the center-of-mass and relative motions have been derived. Compared with previous works, lower binding energies for large bipolarons in three dimensions (3D) and two dimensions (2D) have been calculated. As a result, the values of lower bounds to critical ratios between dielectric constants below which bipolarons can exist are obtained as ${\mathrm{\ensuremath{\eta}}}_{\mathit{c}}$=1.23 in 3D and ${\mathrm{\ensuremath{\eta}}}_{\mathit{c}}$=1.64 in 2D.