Tunnelling density of states at Coulomb-blockade peaksN. Sedlmayr, I. V. Yurkevich and I. V. Lerner
School of Physics and Astronomy, University of Birmingham Birmingham B15 2TT, UK
received 24 July 2006; accepted 9 August 2006
published online 30 August 2006
We calculate the tunnelling density of states (TDoS) for a quantum dot in the Coulomb-blockade regime, using a functional integral representation with allowing correctly for the charge quantisation. We show that in addition to the well-known gap in the TDoS in the Coulomb-blockade valleys, there is a suppression of the TDoS at the peaks. We show that such a suppression is necessary in order to get the correct result for the peak of the differential conductance through an almost close quantum dot.
73.23.Hk - Coulomb blockade; single-electron tunnelling.
73.23.-b - Electronic transport in mesoscopic systems.
73.63.-b - Electronic transport in nanoscale materials and structures.
© EDP Sciences 2006