Europhys. Lett.
Volume 76, Number 1, October 2006
Page(s) 109 - 114
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 30 August 2006
Europhys. Lett., 76 (1), pp. 109-114 (2006)
DOI: 10.1209/epl/i2006-10236-0

Tunnelling density of states at Coulomb-blockade peaks

N. 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