Finite temperature effects in Coulomb blockade quantum dots and signatures of spectral scrambling

Journal Article · Wed Dec 15 04:00:00 EST 1999 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.60.R16315· OSTI ID:20217832

Alhassid, Y ^[1]; Malhotra, S ^[1]

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1. Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, Connecticut 06520 (United States)

The conductance in Coulomb blockade quantum dots exhibits sharp peaks whose spacings fluctuate with the number of electrons. We derive the temperature dependence of these fluctuations in the statistical regime and compare with recent experimental results. The scrambling due to Coulomb interactions of the single-particle spectrum with the addition of an electron to the dot is shown to affect the temperature dependence of the peak spacing fluctuations. Spectral scrambling also leads to saturation in the temperature dependence of the peak-to-peak correlator, in agreement with recent experimental results. The signatures of scrambling are derived using discrete Gaussian processes, which generalize the Gaussian ensembles of random matrices to systems that depend on a discrete parameter--in this case, the number of electrons in the dot. (c) 1999 The American Physical Society.

• OSTI ID: 20217832
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 24 Vol. 60; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COULOMB FIELD
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
FLUCTUATIONS
GAUSSIAN PROCESSES
SEMICONDUCTOR DEVICES
TEMPERATURE DEPENDENCE
THEORETICAL DATA