Phys. Rev. B 61, 8631–8634 (2000)Effective mass of the E⊗e Jahn-Teller polaron in comparison with the Holstein polaronReceived 29 November 1999; published in the issue dated 1 April 2000 Based on an exact expression for the self-energy of the Jahn-Teller polaron, we find that symmetry of pseudospin rotation makes the vertex correction much less effective than that for the Holstein polaron. This ineffectiveness brings about a smaller effective mass m* and a quantitatively different large-to-small polaron crossover, as examined by exact diagonalization in a two-site system. In the strong-coupling and antiadiabatic region, a rigorous analytic expression is found for m*. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.8631
DOI:
10.1103/PhysRevB.61.8631
PACS:
71.38.+i, 71.23.An, 71.28.+d, 71.70.Ej
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