Regensburg 2004 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 37: Quantenpunkte und -drähte: Transporteigenschaften
HL 37.10: Vortrag
Donnerstag, 11. März 2004, 12:30–12:45, H13
Resonance Kondo tunneling through a double quantum dot at finite bias — •Mikhail Kiselev1, Konstantin Kikoin2, and Laurens W. Molenkamp3 — 1Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany — 2Ben-Gurion University of Negev, Beer-Sheva 84105, Israel — 3Physikalisches Institut (EP3), Universität Würzburg, 97074 Würzburg, Germany
It is shown that the resonance Kondo tunneling through a double quantum dot (DQD) with even occupation and singlet ground state may arise at a strong bias, which compensates the energy of singlet/triplet excitation. Using the renormalization group technique we derive scaling equations and calculate the differential conductance as a function of an auxiliary dc-bias for parallel DQD described by SO(4) symmetry. We analyze the decoherence effects associated with the triplet/singlet relaxation in DQD and discuss the shape of differential conductance line as a function of dc-bias and temperature.