Path-integral approximation on the stability of large bipolarons in quasi-one-dimensional confinement

The stability of the singlet optical bipolaron is investigated in quasi-one-dimensional confinement with parabolic boundary potential. Under the bulk-phonon approximation the Feynman-polaron model is used to display the polaron-bipolaron phase diagram as a function of the Coulomb and phonon coupling strengths and the degree of confinement. ©2000 The American Physical Society