Persistent supersolid phase of hard-core bosons on the triangular lattice

Details Persistent supersolid phase of hard-core bosons on the triangular lattice Persistent supersolid phase of hard-core bosons on the triangular lattice

2005-05-11

arxiv.org/abs/cond-mat/0505257v2

Phys. Rev. Lett. 95, 127206 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, two column format

Scientific paper

10.1103/PhysRevLett.95.127206

We study hard-core bosons with unfrustrated hopping ($t$) and nearest neighbour repulsion ($U$) on the triangular lattice. At half-filling, the system undergoes a zero temperature ($T$) quantum phase transition from a superfluid phase at small $U$ to a supersolid at $U_c \approx 4.45$ in units of $2t$. This supersolid phase breaks the lattice translation symmetry in a characteristic $\sqrt{3} \times \sqrt{3}$ pattern, and is remarkably stable--indeed, a smooth extrapolation of our results indicates that the supersolid phase persists for arbitrarily large $U/t$.

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