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Correlation Effect on Ground State Energy Statistics in Disordered Quantum Dots
Author(s) -
Eto M.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(200003)218:1<139::aid-pssb139>3.0.co;2-o
Subject(s) - quantum dot , physics , coulomb , ground state , correlation , condensed matter physics , magnetic field , electron , electronic correlation , perturbation theory (quantum mechanics) , oscillation (cell signaling) , quantum mechanics , mathematics , chemistry , biochemistry , geometry
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.