Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-07-07
Phys. Rev. Lett. 97, 170407 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
4 Pages, 3 Figures; v4: updated version published in Phys. Rev. Lett.; one reference added
Scientific paper
10.1103/PhysRevLett.97.170407
A model of strongly correlated spinless fermions hopping on a checkerboard lattice is mapped onto a quantum fully-packed loop model. We identify a large number of fluctuationless states specific to the fermionic case. We also show that for a class of fluctuating states, the fermionic sign problem can be gauged away. This claim is supported by numerically evaluating the energies of the low-lying states. Furthermore, we analyze in detail the excitations at the Rokhsar-Kivelson point of this model thereby using the relation to the height model and the single-mode approximation.
Betouras Joseph J.
Fulde Peter
Pollmann Frank
Shtengel Kirill
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