Microscopic model of the Mott-Hubbard localization
Journal Article
·
· Physical Review, B: Condensed Matter; (United States)
- Institute of Theoretical Physics, Warsaw University, PL-00-681 Warszawa, ul.Hoza 69 (Poland) Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)
- Institute of Physics, Technical University, PL-30-084 Krakow (Poland)
We devise a variational approach to the metal-insulator transition (MIT) that combines the Mott and Hubbard aspects of localization. Starting from the Gutzwiller approach, we optimize the ground-state energy not only with respect to the double occupancy {eta}, but also with respect to the single-particle wave functions, which enter the energy via expressions for the Coulomb interaction {ital U} and for the bare bandwidth {ital W}. In effect, we obtain a theory of the MIT without resorting to a parametrization in terms of {ital U}/{ital W}. The effective mass close to the MIT is strongly enhanced even when the transition is discontinuous.
- DOE Contract Number:
- FG02-90ER45427
- OSTI ID:
- 7205827
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 45:7; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
STATISTICAL MODELS
ELECTRON-ELECTRON INTERACTIONS
CORRELATION FUNCTIONS
GROUND STATES
HAMILTONIANS
QUANTIZATION
VARIATIONAL METHODS
WAVE FUNCTIONS
ENERGY LEVELS
FUNCTIONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
PARTICLE INTERACTIONS
QUANTUM OPERATORS
665000* - Physics of Condensed Matter- (1992-)
SUPERCONDUCTIVITY AND SUPERFLUIDITY
STATISTICAL MODELS
ELECTRON-ELECTRON INTERACTIONS
CORRELATION FUNCTIONS
GROUND STATES
HAMILTONIANS
QUANTIZATION
VARIATIONAL METHODS
WAVE FUNCTIONS
ENERGY LEVELS
FUNCTIONS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
PARTICLE INTERACTIONS
QUANTUM OPERATORS
665000* - Physics of Condensed Matter- (1992-)