Statistics of conductance oscillations of a quantum dot in the Coulomb-blockade regime
Sektion Physik der Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, D-80539 München
Accepted: 27 February 1997
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.
PACS: 73.20.Dx – Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers) / 73.23.Hk – Coulomb blockade; single-electron tunneling / 05.45.+b – Theory and models of chaotic systems
© EDP Sciences, 1997