Charge and Statistics of Quantum Hall Quasi-Particles. A numerical study of mean values and fluctuations

Details Charge and Statistics of Quantum Hall Quasi-Particles. A numerical study of mean values and fluctuations Charge and Statistics of Quantum Hall Quasi-Particles. A numerical study of mean values and fluctuations

1999-01-25

arxiv.org/abs/cond-mat/9901266v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

39 pages, 27 figures

Scientific paper

10.1016/S0550-3213(99)00353-3

We present Monte Carlo studies of charge expectation values and charge fluctuations for quasi-particles in the quantum Hall system. We have studied the Laughlin wave functions for quasi-hole and quasi-electron, and also Jain's definition of the quasi-electron wave function. The considered systems consist of from 50 to 200 electrons, and the filling fraction is 1/3. For all quasi-particles our calculations reproduce well the expected values of charge; -1/3 times the electron charge for the quasi-hole, and 1/3 for the quasi-electron. Regarding fluctuations in the charge, our results for the quasi-hole and Jain quasi-electron are consistent with the expected value zero in the bulk of the system, but for the Laughlin quasi-electron we find small, but significant, deviations from zero throughout the whole electron droplet. We also present Berry phase calculations of charge and statistics parameter for the Jain quasi-electron, calculations which supplement earlier studies for the Laughlin quasi-particles. We find that the statistics parameter is more well behaved for the Jain quasi-electron than it is for the Laughlin quasi-electron.

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