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Pekar's ansatz and the strong coupling problem in polaron theory


Institute of Mathematical Problems of Biology, Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Prof. Vitkevich str. 1, Pushchino, Moscow Region, 142290, Russian Federation

The translationally invariant polaron theory of Tulub is discussed in detail which makes no use the Pekar's ansatz (believed to provide the asymptotically exact solution in the strong coupling limit) and fundamentally produces a lower-energy polaron than when using the anzatz. In the case of the bipolaron, the theory yields the best values for bonding energy and for critical stability parameters. A variety of physical implications of the existence of translationally invariant polarons and bipolarons are discussed.

Fulltext pdf (224 KB)
Fulltext is also available at DOI: 10.3367/UFNe.0185.201503d.0317
Keywords: Froehlich Hamiltonian, Lee—Low—Pines transformation, weak coupling, Bose condensate, F-center
PACS: 71.38.−k, 74.20.−z, 74.72.−h (all)
DOI: 10.3367/UFNe.0185.201503d.0317
URL: https://ufn.ru/en/articles/2015/3/d/
000356096100004
2015PhyU...58..295L
Citation: Lakhno V D "Pekar's ansatz and the strong coupling problem in polaron theory" Phys. Usp. 58 295–308 (2015)
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Received: 29th, November 2013, revised: 10th, December 2014, 20th, May 2014

Оригинал: Лахно В Д «Анзац Пекара и проблема сильной связи в теории полярона» УФН 185 317–331 (2015); DOI: 10.3367/UFNr.0185.201503d.0317

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