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Session B23 - DCMP: MONTE CARLO AND OTHER RANDOM METHODS
mixed session, Monday morning, March 20, 11:00
Room F, San Jose Convention Center
The microscopic structure of a quantized vortex core in 2 d ^4 He is investigated using the Fixed-Phase Quantum Monte Carlo approach. We present a general method to improve, in a systematic way, a given mean-field many-body phase, based on stochastic averages. Considering the Feynman phase ( \varphi_F = \sum_i \theta_i , where \theta_i is the azimuthal angle of particle i ) as zeroth order ansatz, we show that our scheme generates backflow corrections improving the overall properties of the vortex. In this way, we evaluate particle density, circulating current, core radius and energy for an isolated vortex at zero temperature.
^* Supported by NSF grant number DMR-91-17822.
