Abstract
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 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.
- Received 23 January 2003
DOI:https://doi.org/10.1103/PhysRevB.68.155323
©2003 American Physical Society