Approximate ground state of a confined Coulomb anyon gas in an external magnetic field

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We derive an analytic, albeit approximate, expression for the ground state energy of N Coulomb interacting anyons with fractional statistics nu, 0$\lt$=|nu|$\lt$=1, confined in a two-dimensional well (with characteristic frequency omega0) and subjected to an external magnetic field (with cyclotron frequency omegac). We apply a variational principle combined with a regularization procedure which consists of fitting a cutoff parameter to existing exact analytical results in the noninteracting case, and to numerical calculations for electrons in quantum dots in the interacting case. The resulting expression depends upon parameters of the system |nu|,N,omega0,r0,aB and omegac, where r0 represents a characteristic unit length and aB the Bohr radius. Validity of the result is critically assessed by a comparison with exact, approximate, and numerical results from the literature.

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