Composite bosons and quantum coherent effects in the negative-[ital U] Hubbard model

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.8923· OSTI ID:6707486

Kopec, T K; Umezawa, H ^[1]

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1. The Theoretical Physics Institute, University of Alberta, Edmonton, Alberta, T6G 2J1 (Canada)

A real-time functional-integral approach at finite temperature is used for self-consistent formulation of the dynamics and superconducting phase transition of preformed composite bosons in the extended negative-[ital U] Hubbard model in the large-[ital U] limit. By employing the representation in terms of the amplitude and phase of the bound-pair field we derive the effective phase Hamiltonian and exploit the effects associated with coherent bound-pair tunneling at the microscopic level---responsible for the phase-coherent state, as well as the dissipative effects due to quasiparticle charge transfer. Striking formal similarity of the physical picture in the large-[ital U] limit to those modeled by Josephson-coupled arrays with charging effects is pointed out.

• OSTI ID: 6707486
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:14; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

665411* -- Basic Superconductivity Studies-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BINDING ENERGY
BOSONS
COMPOSITE MODELS
CRYSTAL MODELS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY
HUBBARD MODEL
JOSEPHSON JUNCTIONS
JUNCTIONS
MATHEMATICAL MODELS
PARTICLE MODELS
PHYSICAL PROPERTIES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTIVITY
TUNNEL EFFECT