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

1997/01/30 by F. Simmel, F Simmel, T. Heinzel +3 · 5 citations
Chemistry · Physics and Astronomy · #Advanced Physical and Chemical Molecular Interactions #Quantum and electron transport phenomena #Semiconductor Quantum Structures and Devices #cond-mat.mes-hall

paper · pdf · doi:10.1209/epl/i1997-00212-8

7 pages, 4 figures

arxiv created 1997/01/30 · openalex publication_date 1997/04/10 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

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 to be Gaussian both for zero and for non-zero magnetic field and deviates strongly from the RMT predictions.

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