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|
Tunnelling density of states at Coulomb-blockade peaks
School of Physics and Astronomy, University of Birmingham Birmingham B15 2TT, UK
Accepted: 9 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.
PACS: 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
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