Journal
PHYSICAL REVIEW B
Volume 78, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.241101
Keywords
electron correlations; Hubbard model
Funding
- NSF [DMR0312680, DMR-0706379]
- CMSN, DOE [DE-FG02-04ER46129]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0955980] Funding Source: National Science Foundation
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Using the dynamical cluster approximation, we calculate the correlation functions associated with the nearest-neighbor bond operator which measure the z component of the spin exchange in the two-dimensional Hubbard model with U equal to the bandwidth. We find that in the pseudogap region, the local bond susceptibility diverges at T=0. This shows the existence of degenerate bond spin excitation and implies quantum criticality and bond order formation when long-range correlations are considered. The strong correlation between excitations on parallel neighboring bonds suggests bond singlet dimerization. The suppression of divergence for n
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