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Variational ground state of a system with strong electron-phonon interaction

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
A new variational ground state of a system with strong electron-phonon interaction has been proposed in which the electron subsystem is in a superconducting pairing state and the phonon subsystem is in a two-phonon coherent state. We have shown that such a variational state is necessary for obtaining reasonable magnitudes for the energy and for the effective mass of the charge carriers.
Research Organization:
Center of Theoretical Physics, Chinese Center of Advanced Science Technology (World Laboratory), Beijing, People's Republic of China 200030, People's Republic of China
OSTI ID:
6857806
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:16; ISSN PRBMD
Country of Publication:
United States
Language:
English