期刊
PHYSICAL REVIEW A
卷 85, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.85.061602
关键词
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资金
- ARO [W911NF0710576]
- DARPA OLE
- CNPq
- FAPERJ
- INCT on Quantum Information
- DFG [SFB/TRR 49, FOR 1346]
- Direct For Mathematical & Physical Scien [1005503] Funding Source: National Science Foundation
- Division Of Physics [1005503] Funding Source: National Science Foundation
We determine antiferromagnetic (AF) signatures in the half-filled Hubbard model at strong coupling on a cubic lattice and in lower dimensions. Upon cooling, the transition from the charge-excitation regime to the AF Heisenberg regime is signaled by a universal minimum of the double occupancy at entropy s = S/(Nk(B)) = s* approximate to ln(2) per particle and a linear increase of the next-nearest-neighbor (NNN) spin correlation function for s < s*. This crossover, driven by a gain in kinetic exchange energy, appears as the essential AF physics relevant for current cold-atom experiments. The onset of long-range AF order (at low s on cubic lattices) is hardly visible in nearest-neighbor spin correlations versus s, but could be detected in spin correlations at or beyond NNN distances.
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