Spectral scrambling in Coulomb-blockade quantum dots

Details Spectral scrambling in Coulomb-blockade quantum dots Spectral scrambling in Coulomb-blockade quantum dots

2001-01-31

arxiv.org/abs/cond-mat/0101461v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

13 pages, RevTex, significantly revised and includes new results

Scientific paper

We study the fluctuations of an energy level as a function of the number of electrons $m$ added to a Coulomb-blockade quantum dot. A microscopic calculation in the limit of Koopmans' theorem predicts that the standard deviation of these fluctuations behaves as $\sqrt{m}$ in the absence of surface charge but is linear in $m$ when the effect of a surface charge in a finite geometry is included. The microscopic results are compared to a parametric random-matrix approach. We estimate the number of electrons it takes to scramble the spectrum completely in terms of the interaction strength, the dimensionless Thouless conductance, and the symmetry class.

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