Fabien Trousselet, Arnaud Ralko, Andrzej M. Oles
We study an orbital model of localized t2g electrons on the triangular
lattice and provide evidence of two distinct strongly fluctuating regimes,
depending on type of the interactions. The superexchange regime clearly
indicates the presence of a dimerized valence bond crystal phase, obtained
through an effective quantum dimer model derived from the orbital Hamiltonian
and analyzed numerically. In the opposite direct exchange regime, another
effective model adapted to the local constraints is derived --- here the effect
of subleading perturbations selects a highly resonating ground state, combining
diagonal and off-diagonal long-range orbital orders.
View original:
http://arxiv.org/abs/1111.2939
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