Supersolidity, entropy and frustration

Details Supersolidity, entropy and frustration Supersolidity, entropy and frustration

2007-07-05

arxiv.org/abs/0707.0866v1

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.

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