Variational wavefunction study of the triangular lattice supersolid

Arnab Sen; Prasenjit Dutt; Kedar Damle; R. Moessner

doi:10.1103/physrevlett.100.147204

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arXiv · 0801.0791

Variational wavefunction study of the triangular lattice supersolid

Arnab Sen·Prasenjit Dutt·Kedar Damle·R. Moessner

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Abstract

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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Arnab Sen, Prasenjit Dutt, Kedar Damle, R. Moessner. 2008-01-09. Variational wavefunction study of the triangular lattice supersolid. https://doi.org/10.1103/physrevlett.100.147204

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