Quasi-two-dimensional Feynman bipolarons
Senger, R. T.
Physical Review B - Condensed Matter and Materials Physics
American Physical Society
10 070 - 10 079
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We study the stability criterion for the formation of two-dimensionally confined large bipolarons. The electrons are treated as bounded within a parabolic potential well while being coupled to one another via the Fröhlich interaction Hamiltonian. Within the framework of the bulk-phonon approximation we adopt the Feynman-polaron model to derive variational results over a wide range of the Coulomb interaction and phonon coupling strengths interpolating between the bulk and the two-dimensional confinement limit. It is shown that the critical values of the electron-phonon coupling constant and the ratio of dielectric constants (η=ε∞/ε0) exhibit some nontrivial features as the effective dimensionality is tuned from 3 to 2. ©1999 The American Physical Society.