Smearing of Coulomb Blockade by Resonant Tunneling

Details Smearing of Coulomb Blockade by Resonant Tunneling Smearing of Coulomb Blockade by Resonant Tunneling

2000-10-04

arxiv.org/abs/cond-mat/0010068v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.85.4582

We study the Coulomb blockade in a grain coupled to a lead via a resonant impurity level. We show that the strong energy dependence of the transmission coefficient through the impurity level can have a dramatic effect on the quantization of the grain charge. In particular, if the resonance is sufficiently narrow, the Coulomb staircase shows very sharp steps even if the transmission through the impurity at the Fermi energy is perfect. This is in contrast to the naive expectation that perfect transmission should completely smear charging effects.

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