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| Paper IPM / P / 11182 |
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| Abstract: | |||||||
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We investigate the bipolaronic crossover and the pairing transition for a two-orbital model with Jahn-Teller
coupling to a two-fold degenerate phonon mode. The evolution from weak to strong coupling is reminiscent
of the behavior of the single-band Holstein model: The polaron crossover in which the electrons and phonons
become strongly entangled occurs for a weaker coupling than the binding of bipolarons, which gives rise to
a metal-insulator transition. Interestingly, a single bipolaronic transition takes place also when the two bands
have significantly different bandwidths, as opposed to the case of repulsive Hubbard-like interactions for which
an orbital-selective Mott transition has been reported. This behavior is related to the inter-orbital nature of the
Jahn-Teller coupling.
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