Abstract
The properties of large bipolarons in two and three dimensions areinvestigated by averaging over the relative wavefunction of the twoelectrons and using the Lee-Low-Pines-Huybrechts variational method.The ground-state (GS) and excited-state energies of the Fröhlichbipolaron for the whole range of electron-phonon coupling constantscan be obtained. The energies of the first relaxed excited state(RES) and Franck–Condon (FC) excited state of the bipolaron are alsocalculated. It is found that the first RES energy is lower than theFC state energy. The comparison of our GS and RES energies withthose in literature is also given.
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