2 research outputs found
Conductance of the Single Electron Transistor for Arbitrary Tunneling Strength
We study the temperature and gate voltage dependence of the conductance of
the single electron transistor focusing on highly conducting devices. Electron
tunneling is treated nonperturbatively by means of path integral Monte Carlo
techniques and the conductance is determined from the Kubo formula. A
regularized singular value decomposition scheme is employed to calculate the
conductance from imaginary time simulation data. Our findings are shown to
bridge between available analytical results in the semiclassical and
perturbative limits and are found to explain recent experimental results in a
regime not accessible by earlier methods.Comment: 4 pages, 2 figure
Semiclassical cross section correlations
We calculate within a semiclassical approximation the autocorrelation
function of cross sections. The starting point is the semiclassical expression
for the diagonal matrix elements of an operator. For general operators with a
smooth classical limit the autocorrelation function of such matrix elements has
two contributions with relative weights determined by classical dynamics. We
show how the random matrix result can be obtained if the operator approaches a
projector onto a single initial state. The expressions are verified in
calculations for the kicked rotor.Comment: 6 pages, 2 figure