Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-05-07
Phys. Rev. B 76, 104436 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 15 figures, minor changes, references added, Phys Rev B version
Scientific paper
10.1103/PhysRevB.76.104436
We consider the simplest generalizations of the valence bond physics of SU(2) singlets to SU(N) singlets that comprise objects with N sites -- these are SU(N) singlet plaquettes with N=3 and N=4 in three spatial dimensions. Specifically, we search for a quantum mechanical liquid of such objects -- a resonating singlet valence plaquette phase that generalizes the celebrated resonating valence bond phase for SU(2) spins. We extend the Rokhsar-Kivelson construction of the quantum dimer model to the simplest SU(4) model for valence plaquette dynamics on a cubic lattice. The phase diagram of the resulting quantum plaquette model is analyzed both analytically and numerically. We find that the ground state is solid everywhere, including at the Rokhsar-Kivelson point where the ground state is an equal amplitude sum. By contrast, the equal amplitude sum of SU(3) singlet triangular plaquettes on the face centered cubic lattice is liquid and thus a candidate for describing a resonating single valence plaquette phase, given a suitably defined local Hamiltonian.
Moessner Richhild
Pankov Sergey
Sondhi Shivaji L.
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