Analytic peculiarities of the polaron mass operator in the first two orders of the coupling constant

• Published in: Condensed Matter Physics
• Date: 1998
• Main Authors: Tkach, M., Voitsekhivska, O., Val', O.
• Format: Article
• Language: English
• Published: Інститут фізики конденсованих систем НАН України 1998
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/118934
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Analytic peculiarities of the polaron mass operator in the first two orders of the coupling constant / M. Tkach, O. Voitsekhivska, O. Val' // Condensed Matter Physics. — 1998. — Т. 1, № 2(14). — С. 401-408. — Бібліогр.: 5 назв. — англ.

The exact analytic expression for the polaron mass operator in the second order of the coupling constant is established for the first time. It holds in the whole energy scale. The peculiarities of the mass operator are analysed. The renormalized polaron energy spectrum is obtained and analysed in...