Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-03-19
Phys. Rev. B 70, 115315 (2004).
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
18 pages, 20 Figures, submitted to Phys. rev. B
Scientific paper
10.1103/PhysRevB.70.115315
We investigate current fluctuations in a three-terminal quantum dot in the sequential tunneling regime. In the voltage-bias configuration chosen here, the circuit is operated like a beam splitter, i.e. one lead is used as an input and the other two as outputs. In the limit where a double occupancy of the dot is not possible, a super-Poissonian Fano factor of the current in the input lead and positive cross-correlations between the current fluctuations in the two output leads can be obtained, due to dynamical channel-blockade. When a single orbital of the dot transports current, this effect can be obtained by lifting the spin-degeneracy of the circuit with ferromagnetic leads or with a magnetic field. When several orbitals participate in the electronic conduction, lifting spin-degeneracy is not necessary. In all cases, we show that a super-Poissonian Fano factor for the input current is not equivalent to positive cross-correlations between the outputs. We identify the conditions for obtaining these two effects and discuss possible experimental realizations.
Belzig Wolfgang
Bruder Christoph
Cottet Audrey
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