Itinerant ferromagnetism in a Fermi gas with contact interaction: Magnetic properties in a dilute Hubbard model

Journal Article · Wed Dec 15 04:00:00 EST 2010 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.82.061603· OSTI ID:21528800

Chiachen, Chang ^[1]; Shiwei, Zhang ^[1]; Ceperley, David M ^[2]

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1. Department of Physics, College of William and Mary, Williamsburg, VA 23187 (United States)
2. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801 (United States)

Ground-state properties of the repulsive Hubbard model on a cubic lattice are investigated by means of the auxiliary-field quantum Monte Carlo method. We focus on low-density systems with varying on-site interaction U/t, as a model relevant to recent experiments on itinerant ferromagnetism in a dilute Fermi gas with contact interaction. Twist-average boundary conditions are used to eliminate open-shell effects and large lattice sizes are studied to reduce finite-size effects. The sign problem is controlled by a generalized constrained path approximation. We find no ferromagnetic phase transition in this model. The ground-state correlations are consistent with those of a paramagnetic Fermi liquid.

• OSTI ID: 21528800
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 82; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
APPROXIMATIONS
BOUNDARY CONDITIONS
CALCULATION METHODS
CORRELATIONS
CRYSTAL LATTICES
CRYSTAL MODELS
CRYSTAL STRUCTURE
CUBIC LATTICES
FERMI GAS
FERROMAGNETISM
HUBBARD MODEL
INTERACTIONS
MAGNETIC PROPERTIES
MAGNETISM
MATHEMATICAL MODELS
MONTE CARLO METHOD
PARAMAGNETISM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES