Volume 218, Issue 1 pp. 139-143
Original Paper

Correlation Effect on Ground State Energy Statistics in Disordered Quantum Dots

M. Eto

M. Eto

Department of Applied Physics/DIMES, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands Tel.: +31-15-278-6154; Fax: +31-15-278-1203

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Abstract

Distribution of peak spacings of the Coulomb oscillation is theoretically investigated in disordered quantum dots. Taking account of the electron–electron interaction by the perturbation, we show that a pair-type (BCS-type) correlation plays an important role in determining the distribution in the diffusive region. The correlation effect can result in a sharp peak structure of the distribution, deviating drastically from the prediction of the random matrix theory, in the absence of a magnetic field. Numerical results support the proposed mechanisms. The pair-type correlation does not work in the presence of a magnetic field.

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