2 papers
cond-mat.mes-hall2000
Smearing of Coulomb Blockade by Resonant Tunneling
Thomas Gramespacher, K. A. Matveev
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 impu…
chao-dyn1996
Small Denominators, Frequency Operators, and Lie Transforms for Nearly-Integrable Quantum Spin Systems
Thomas Gramespacher, Stefan Weigert
Based on the previously proposed notions of action operators and of quantum integrability, frequency operators are introduced in a fully quantum-mechanical setting. They are concep…