Abstract
The polaron has been of interest in condensed matter theory and field theory for about half a century, especially the limit of large coupling constant, a. It was not until 1983, however, that a proof of the asymptotic formula for the ground state energy was finally given by using difficult arguments involving the large deviation theory of path integrals. Here we derive the same asymptotic result, E 0~ —Cα2,and with explicit error bounds, by simple, rigorous methods applied directly to the Hamiltonian. Our method is easily generalizable to other settings, e.g., the excitonic and magnetic polarons.
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Lieb, E.H., Thomas, L.E. (1997). Exact Ground State Energy of the Strong-Coupling Polaron. In: Nachtergaele, B., Solovej, J.P., Yngvason, J. (eds) Condensed Matter Physics and Exactly Soluble Models. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-06390-3_21
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DOI: https://doi.org/10.1007/978-3-662-06390-3_21
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