Monte Carlo calculation of dynamical properties of the two-dimensional Hubbard model

Monte Carlo calculation of dynamical properties of the two-dimensional Hubbard model

A new method is introduced for analytically continuing imaginary-time data from quantum Monte Carlo calculations to the real-frequency axis. The method is based on a least-squares-fitting procedure with constraints of positivity and smoothness on the real-frequency quantities. Results are shown for...

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Veröffentlicht in:Physical review letters 1989-10, Vol.63 (14), p.1523-1526
Hauptverfasser: White, S. R., Scalapino, D. J., Sugar, R. L., Bickers, N. E.
Format: Artikel
Sprache:eng
Schlagworte:
656100 - Condensed Matter Physics- Superconductivity
ANALYTICAL SOLUTION
CALCULATION METHODS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed matter: electronic structure, electrical, magnetic, and optical properties
CORRELATION FUNCTIONS
CORRELATIONS
ELECTRON GAS
Electron states
ELECTRON-ELECTRON INTERACTIONS
Exact sciences and technology
FLUIDS
FUNCTIONS
GASES
GREEN FUNCTION
INTERACTIONS
LEAST SQUARE FIT
LEPTON-LEPTON INTERACTIONS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATRICES
MAXIMUM-LIKELIHOOD FIT
MECHANICS
MONTE CARLO METHOD
NUMERICAL SOLUTION
PARTICLE INTERACTIONS
PHYSICAL PROPERTIES
Physics
SIMULATION
Solid-State Physics
STABILITY
STATISTICAL MECHANICS
TEMPERATURE DEPENDENCE
Theories and models of many electron systems
TIME DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS
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Beschreibung
Zusammenfassung:A new method is introduced for analytically continuing imaginary-time data from quantum Monte Carlo calculations to the real-frequency axis. The method is based on a least-squares-fitting procedure with constraints of positivity and smoothness on the real-frequency quantities. Results are shown for the single-particle spectral-weight function and density of states for the half-filled, two-dimensional Hubbard model.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.63.1523