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| Paper IPM / P / 12465 |
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Ground-state properties of a two-dimensional fluid of bosons with repulsive dipole-dipole interactions are
studied by means of the Euler-Lagrange hypernetted-chain approximation.
We present a self-consistent semi-analytical theory of the pair distribution function g(r) and ground-state energy of this system. Our approach is based on the solution of a zero-energy scattering Schrödinger equation for the "pair amplitude" √{g(r)} with an effective potential from Jastrow-Feenberg correlations. We find excellent agreement with quantum Monte Carlo results over a wide range of coupling strenght, nearly up to the critical coupling for the liquid-to-crystal quantum phase transition. We also calculate the one-body density matrix and related quantities, such as the momentum distribution function and the condensate fraction.
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