Quantum Monte Carlo simulations of the one-dimensional extended Hubbard model
We report preliminary results of an investigation of the thermodynamic properties of the extended Hubbard model in one- dimension, calculated with the world-line Monte Carlo method described by Hirsch et al. With strictly continuous world-lines, we are able to measure the expectation of operators that conserve fermion number locally, such as the energy and (spatial) occupation number. By permitting the world-lines to be broken'' stochastically, we may also measure the expectation of operators that conserve fermion number only globally, such as the single-particle Green's function. For a 32 site lattice we present preliminary calculations of the average electron occupancy as a function of wavenumber when U = 4, V = 0 and {beta} = 16. For a half-filled band we find no indications of a Fermi surface. Slightly away from half-filling, we find Fermi-surface-like behavior similar to that found in other numerical investigations. 8 refs., 3 figs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- DOE/MA
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5578810
- Report Number(s):
- LA-UR-89-3231; CONF-8908106-1; ON: DE90000688; TRN: 89-024376
- Resource Relation:
- Conference: Los Alamos workshop on quantum simulations of condensed matter, Los Alamos, NM (USA), 8-11 Aug 1989
- Country of Publication:
- United States
- Language:
- English
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SUPERCONDUCTIVITY AND SUPERFLUIDITY
ELECTRON-ELECTRON COLLISIONS
MONTE CARLO METHOD
ELECTRON-PHONON COUPLING
FERMI LEVEL
FEYNMAN PATH INTEGRAL
GREEN FUNCTION
HAMILTONIANS
PARTITION FUNCTIONS
PHONONS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
COLLISIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON COLLISIONS
ENERGY LEVELS
FUNCTIONS
INTEGRALS
MATHEMATICAL OPERATORS
PHYSICAL PROPERTIES
QUANTUM OPERATORS
QUASI PARTICLES
656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
656100 - Condensed Matter Physics- Superconductivity