Splitting of the lower subband of Hubbard fermions in the Shubin–Vonsowsky model under the influence of strong intersite correlations

• Published in: Journal of experimental and theoretical physics Vol. 112; no. 1; pp. 108 - 120
• Main Authors: Val’kov, V. V., Korovushkin, M. M.
• Format: Journal Article
• Language: English
• Published: Moscow Nauka/Interperiodica 01.01.2011; Springer
• Subjects: Classical and Quantum Gravitation; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COOPER PAIRS; CORRELATIONS; COULOMB FIELD; Disorder; DOPED MATERIALS; ELECTRONS; Elementary Particles; FEYNMAN DIAGRAM; FLUCTUATIONS; HUBBARD MODEL; KINETIC ENERGY; Order; Particle and Nuclear Physics; Phase Transition in Condensed System; Physics; Physics and Astronomy; Quantum Field Theory; Relativity Theory; RENORMALIZATION; SCATTERING AMPLITUDES; Solid State Physics; SUPERCONDUCTIVITY; Superconductors; TRANSITION TEMPERATURE; Strength Operator; Matsubara Frequency; Mass Operator; Spectral Intensity; Occupation Number

The diagram technique for Hubbard operators is used to investigate the influence of intersite Coulomb interactions on the energy structure and Cooper instability of strongly correlated fermions. Allowance for intersite correlations in doped Mott-Hubbard insulators is shown to lead to a splitting of...