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Transient effects in electron transport through quantum dots

Wiertel M., Parafiniuk P., Taranko R.

Optica Applicata

2009

Vol. 39, nr 4

959-965

We investigate the transient electron transport through the quantum dot and double quantum dot systems coupled with the time-dependent barriers to infinitely large reservoirs of noninteracting electrons. Time-dependent currents and quantum dot occupancies are calculated using both nonequilibrium Green's functions formalism and the equation of motion method for appropriate correlation functions. We show that the sequence of ultrafast modulation of the tunneling amplitudes between the electron reservoirs and the quantum dots can induce quite different electron occupation of the quantum dot in comparison with the static case. We also find that the oscillations of the transient current following the sudden coupling of the electron reservoirs with the double quantum dot system have the same frequency as Rabi's oscillations of the double dot state vector.transient current.

Orbital Kondo anomaly and channel mixing effects in a double quantum dot

Sztenkiel D., Świrkowicz R.

Materials Science Poland

2008

Vol. 26, No. 3

699--706

A system consisting of two quantum dots connected to separate reservoirs is studied and electron transport properties are investigated in the Kondo regime with use of the non-equilibrium Green function technique based on the method of equation of motion. As the orbital quantum number is conserved during tunnelling processes when each dot is attached to its own leads, the orbital SU(2) Kondo effect is observed. It is shown that the mixing between the leads strongly modifies transport properties leading to a considerable suppression of the Kondo resonance.