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Using an exact-diagonalization technique on small clusters, we calculate the spin and density excitation spectra as well as the temperature dependence of the specific heat for the triangular-lattice t-J model with the multiple-spin exchange interactions, whereby we consider the low-energy excitations of the two-dimensional liquid 3He adsorbed on graphite. We find that, for a relevant set of the parameter values, the spectral weight for the spin excitations is concentrated on a very low-energy region, while that of the density excitations extends over a wide energy range, indicating the clear separation of their energy scales. The double-peak structure in the temperature dependence of the specific heat is also obtained. © 2009 IOP Publishing Ltd

Spin and mass excitations in the doped multiple spin exchange model on a triangular lattice:3He on graphite

Spin and mass excitations in the doped multiple spin exchange model on a triangular lattice:³He on graphite