3 research outputs found
Discrete charging of metallic grains: Statistics of addition spectra
We analyze the statistics of electrostatic energies (and their differences)
for a quantum dot system composed of a finite number of electron islands
(metallic grains) with random capacitance-inductance matrix , for which the
total charge is discrete, (where is the charge of an electron and
is an integer). The analysis is based on a generalized charging model,
where the electrons are distributed among the grains such that the
electrostatic energy E(N) is minimal. Its second difference (inverse
compressibility) represents the spacing between
adjacent Coulomb blockade peaks appearing when the conductance of the quantum
dot is plotted against gate voltage. The statistics of this quantity has been
the focus of experimental and theoretical investigations during the last two
decades. We provide an algorithm for calculating the distribution function
corresponding to and show that this function is piecewise
polynomial.Comment: 21 pages, no figures, mathematical nomenclature (except for Abstract
and Introduction
Non-Gaussian distribution of nearest-neighbour Coulomb peak spacings in metallic single-electron transistors
The distribution of nearest-neighbour spacings of Coulomb blockade
oscillation peaks in normal conducting aluminum single-electron
transistors is found to be non-Gaussian. A pronounced tail to reduced
spacings is observed, which we attribute to impurity-specific
parametric charge rearrangements close to the transistor. Our
observation may explain the absence of a Wigner-Dyson
distribution in the experimental nearest-neighbour spacing
distributions in semiconductor quantum dots