Quantum Monte Carlo by message passing

Conference · Fri Jan 01 04:00:00 EST 1993

OSTI ID:6496468

Bonca, J; Gubernatis, J E

We summarize results of quantum Monte Carlo simulations of the degenerate single-impurity Anderson model using the impurity algorithm of Hirsch and Fye. Using methods of Bayesian statistical inference, coupled with the principle of maximum entropy, we extracted the single-particle spectral density from the imaginary-time Green's function. The variations of resulting spectral densities with model parameters agree qualitatively with the spectral densities predicted by NCA calculations. All the simulations were performed on a cluster of 16 IBM R6000/560 workstations under the control of the message-passing software PVM. We described the trivial parallelization of our quantum Monte Carlo code both for the cluster and the CM-5 computer. Other issues for effective parallelization of the impurity algorithm are also discussed.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6496468
• Report Number(s): LA-UR-93-1296; CONF-9302112--2; ON: DE93012645
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
ALLOYS
CALCULATION METHODS
COMPUTERIZED SIMULATION
DILUTE ALLOYS
FUNCTIONS
GREEN FUNCTION
HAMILTONIANS
KONDO EFFECT
MAGNETIC MATERIALS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS
MATHEMATICAL LOGIC
MATHEMATICAL OPERATORS
MONTE CARLO METHOD
PARALLEL PROCESSING
PHYSICAL PROPERTIES
PROGRAMMING
QUANTUM OPERATORS
SIMULATION