Statistics of conductance oscillations of a quantum dot in the Coulomb-blockade regime

Details Statistics of conductance oscillations of a quantum dot in the Coulomb-blockade regime Statistics of conductance oscillations of a quantum dot in the Coulomb-blockade regime

1997-01-30

arxiv.org/abs/cond-mat/9701226v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures

Scientific paper

10.1209/epl/i1997-00212-8

The fluctuations and the distribution of the conductance peak spacings of a quantum dot in the Coulomb-blockade regime are studied and compared with the predictions of random matrix theory (RMT). The experimental data were obtained in transport measurements performed on a semiconductor quantum dot fabricated in a GaAs-AlGaAs heterostructure. It is found that the fluctuations in the peak spacings are considerably larger than the mean level spacing in the quantum dot. The distribution of the spacings appears Gaussian both for zero and for non-zero magnetic field and deviates strongly from the RMT-predictions.

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