Tunneling and nonhyperbolicity in quantum dots

We argue that many major features in electronic transport in realistic quantum dots are not explainable by the usual semiclassical approach, due to the contributions of the quantum-mechanical tunneling of the electrons through the Kolmogorov-Arnol'd-Moser islands. We show that dynamical tunneli...

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Bibliographic Details
Published in:Physical review letters 2002-06, Vol.88 (23), p.236804-236804, Article 236804
Main Authors: De Moura, Alessandro P S, Lai, Ying-Cheng, Akis, Richard, Bird, Jonathan P, Ferry, David K
Format: Article
Language:English
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Summary:We argue that many major features in electronic transport in realistic quantum dots are not explainable by the usual semiclassical approach, due to the contributions of the quantum-mechanical tunneling of the electrons through the Kolmogorov-Arnol'd-Moser islands. We show that dynamical tunneling gives rise to a set of resonances characterized by two quantum numbers, which leads to conductance oscillations and concentration of wave functions near stable and unstable periodic orbits. Experimental results agree very well with our theoretical predictions, indicating that tunneling has to be taken into account to understand the physics of transport in generic nanostructures.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.88.236804