6533b85bfe1ef96bd12bb61e
RESEARCH PRODUCT
Néel Transition of Lattice Fermions in a Harmonic Trap: A Real-Space Dynamic Mean-Field Study
Walter HofstetterIrakli TitvinidzeN. BlümerMichiel SnoekE. V. Goreliksubject
Condensed Matter::Quantum GasesPhysicsOptical latticeCondensed matter physicsMean field theoryQuantum mechanicsQuantum Monte CarloMonte Carlo methodGeneral Physics and AstronomyAntiferromagnetismObservableFermionNéel temperaturedescription
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.
year | journal | country | edition | language |
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2010-01-01 | Physical Review Letters |