1,771 research outputs found
Coulomb-interaction effects in full counting statistics of a quantum-dot Aharonov-Bohm interferometer
We study the effect of Coulomb interaction on the full counting statistics of
an Aharonov-Bohm (AB) interferometer with a single-level quantum dot in one arm
in the regime of weak dot-lead and lead-lead tunnel couplings. In the absence
of Coulomb interaction, the interference processes are of nonresonant nature
with an even AB flux dependence and obey bidirectional Poissonian statistics.
For large charging energy, the statistic of these processes changes. In
addition, processes of resonant nature with an odd flux dependence appear. In
the limit of strongly asymmetric tunnel couplings from the dot to the left and
right leads, their statistics is found to be strongly super-Poissonian.Comment: 8 pages, 3 figure
Tunable dynamical channel blockade in double-dot Aharonov-Bohm interferometers
We study electronic transport through an Aharonov-Bohm interferometer with
single-level quantum dots embedded in the two arms. The full counting
statistics in the shot-noise regime is calculated to first order in the
tunnel-coupling strength. The interplay of interference and charging energy in
the dots leads to a dynamical channel blockade that is tunable by the magnetic
flux penetrating the Aharonov-Bohm ring. We find super-Poissonian behavior with
diverging second and higher cumulants when the Aharonov-Bohm flux approaches an
integer multiple of the flux quantum.Comment: published version, 10 pages, 10 figure
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