Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-07-05
Phys. Rev. B 76, 144420 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, igures, LaTex
Scientific paper
We study the properties of t-t'-V model of hard-core bosons on the triangular lattice that can be realized in optical lattices. By mapping to the spin-1/2 XXZ model in a field, we determine the phase diagram of the t-V model where the supersolid characterized by the ordering pattern (x,x,-2x') ("ferrimagnetic" or SS A) is a ground state for chemical potential \mu >3V. By turning on either temperature or t' at half-filling \mu =3V, we find a first order transition from SS A to the elusive supersolid characterized by the (x,-x,0) ordering pattern ("antiferromagnetic" or SS C). In addition, we find a large region where a superfluid phase becomes a solid upon raising temperature at fixed chemical potential. This is an analog of the Pomeranchuk effect driven by the large entropic effects associated with geometric frustration on the triangular lattice.
Hassan Syed R.
Medici Luca de
Tremblay A. M. -S.
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