Variational wavefunction study of the triangular lattice supersolid

Details Variational wavefunction study of the triangular lattice supersolid Variational wavefunction study of the triangular lattice supersolid

2008-01-07

arxiv.org/abs/0801.0791v2

Phys. Rev. Lett. 100, 147204 (2008)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 2-column PRL format; v2: minor typos fixed

Scientific paper

10.1103/PhysRevLett.100.147204

We present a variational wavefunction which explains the behaviour of the supersolid state formed by hard-core bosons on the triangular lattice. The wavefunction is a linear superposition of {\em only and all} configurations minimising the repulsion between the bosons (which it thus implements as a hard constraint). Its properties can be evaluated exactly--in particular, the variational minimisation of the energy yields (i) the surprising and initially controversial spontaneous density deviation from half-filling (ii) a quantitatively accurate estimate of the corresponding density wave (solid) order parameter.

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