Neel Transition of Lattice Fermions in a Harmonic Trap: A Real-Space Dynamic Mean-Field Study

Journal Article · Fri Aug 06 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.065301· OSTI ID:21470940

Gorelik, E V; Bluemer, N ^[1]; Titvinidze, I; Hofstetter, W ^[2]; Snoek, M ^[3]

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1. Institute of Physics, Johannes Gutenberg University, 55099 Mainz (Germany)
2. Institute for Theoretical Physics, Johann Wolfgang Goethe University, 60438 Frankfurt/Main (Germany)
3. Institute for Theoretical Physics, University of Amsterdam, 1090 GL Amsterdam (Netherlands)

We study the magnetic ordering transition for a system of harmonically trapped ultracold fermions with repulsive interactions in a cubic optical lattice, within a real-space extension of dynamical mean-field theory. Using a quantum Monte Carlo impurity solver, we establish that antiferromagnetic correlations are signaled, at strong coupling, by an enhanced double occupancy. This signature is directly accessible experimentally and should be observable well above the critical temperature for long-range order. Dimensional aspects appear less relevant than naively expected.

• OSTI ID: 21470940
• Journal Information: Physical Review Letters, Vol. 105, Issue 6; Other Information: DOI: 10.1103/PhysRevLett.105.065301; (c) 2010 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
COMPUTERIZED SIMULATION
CORRELATIONS
COUPLING
CRITICAL TEMPERATURE
CUBIC LATTICES
FERMIONS
MAGNETIZATION
MEAN-FIELD THEORY
MONTE CARLO METHOD
NEEL TEMPERATURE
SPACE
TRAPPING
TRAPS
CALCULATION METHODS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
MAGNETISM
PHYSICAL PROPERTIES
SIMULATION
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE