Variational wave-function study of the triangular lattice supersolid

Sen, Arnab ; Dutt, Prasenjit ; Damle, Kedar ; Moessner, R. (2008) Variational wave-function study of the triangular lattice supersolid Physical Review Letters, 100 (14). Article ID 147204. ISSN 0031-9007

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Official URL: http://journals.aps.org/prl/abstract/10.1103/PhysR...

Related URL: http://dx.doi.org/10.1103/PhysRevLett.100.147204

Abstract

We present a variational wave function which explains the behavior of the supersolid state formed by hard-core bosons on the triangular lattice. The wave function is a linear superposition of only and all configurations minimizing the repulsion between the bosons (which it thus implements as a hard constraint). Its properties can be evaluated exactly—in particular, the variational minimization 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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