1996/07/30 by Ganpathy Murthy, Daniel Arovas, Assa Auerbach · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevb.55.3104
Latex format, 24 figures available by email upon request. Submitted to Physical Review B
arxiv created 1996/07/30 · arxiv updated 2009/11/30
We study the ground state of hard-core bosons with nearest-neighbor hopping and nearest-neighbor interactions on the triangular and Kagomé lattices by mapping to a system of spins (S=1\over2), which we analyze using spin-wave theory. We find that the both lattices display superfluid and supersolid (a coexistence of superfluid and solid) order as the parameters and filling are varied. Quantum fluctuations seem large enough in the Kagomé system to raise the interesting possibility of a disordered ground state.