Microscopic model of the Mott-Hubbard localization

Journal Article · Sat Feb 15 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.3799· OSTI ID:7205827

Spalek, J ^[1]; Wojcik, W ^[2]

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1. 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)
2. 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), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:7; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CORRELATION FUNCTIONS
ELECTRON-ELECTRON INTERACTIONS
ENERGY LEVELS
FUNCTIONS
GROUND STATES
HAMILTONIANS
INTERACTIONS
LEPTON-LEPTON INTERACTIONS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
PARTICLE INTERACTIONS
QUANTIZATION
QUANTUM OPERATORS
STATISTICAL MODELS
VARIATIONAL METHODS
WAVE FUNCTIONS