Monte Carlo simulations of two-dimensional charged bosons
Stefania De Palo, Sergio Conti, and Saverio Moroni
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Submission date: 11. Jun. 2003
published in: Physical review / B, 69 (2004) 3, art-no. 035109
DOI number (of the published article): 10.1103/PhysRevB.69.035109
PACS-Numbers: 02.70.Ss, 05.30.Jp
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Quantum Monte Carlo methods are used to calculate various ground state properties of charged bosons in two dimensions, throughout the whole density range where the fluid phase is stable. Wigner crystallization is predicted at . Results for the ground state energy and the momentum distribution are summarized in analytic interpolation formulas embodying known asymptotic behaviors. Near freezing, the condensate fraction is less than 1%. The static structure factor S(k) and susceptibility are obtained from the density-density correlation function in imaginary time, . An estimate of the energy of elementary excitations, given in terms of an upper bound involving S(k) and , is compared with the result obtained via analytic continuation from .