Transient effects in electron transport through quantum dots

• Autorzy: Wiertel M. , Parafiniuk P. , Taranko R.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

quantum dot; double quantum dot; transient current

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2009
• Tom: Vol. 39, nr 4
• Strony: 959--965
• Opis fizyczny: bibliogr. 8 poz.,

Twórcy

autor

Wiertel M.

autor

Parafiniuk P.

autor

Taranko R.

• Institute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

Bibliografia

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• [3] SOUZA F.M., Spin-dependent ringing and beats in a quantum dot system, Physical Review B 76(20), 2007, p. 205315.
• [4] SOUZA F.M., LEAO S.A., GESTER R.M., JAUHO A.P., Transient charging and discharging of spin-polarized electrons in a quantum dot, Physical Review B 76(12), 2007, p. 125318.
• [5] SCHMIDT T.L., WERNER P., MUHLBACHER L., KOMNIK A., Transient dynamics of the Anderson impurity model out of equilibrium, Physical Review B 78(23), 2008, p. 235110.
• [6] STEFANUCCI G., ALMBLADH C.O., Time-dependent partition-free approach in resonant tunneling systems, Physical Review B 69(19), 2004, p. 195318.
• [7] QING-FENG SUN, TSUNG-HAN LIN, Transient current through a quantum dot with two time-dependent barriers, Journal of Physics: Condensed Matter 9(14), 1997, pp. 3043–3053.
• [8] JAUHO A.P., WINGREEN N.S., MEIR Y., Time-dependent transport in interacting and noninteracting resonant-tunneling systems, Physical Review B 50(8), 1994, pp. 5528–5544.