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Tunable nonadiabatic excitation in a single-electron quantum dot.

Kataoka, M; Fletcher, J D; See, P; Giblin, S P; Janssen, T J B M; Griffiths, J P*; Jones, G A C*; Farrer, I*; Ritchie, D A* (2011) Tunable nonadiabatic excitation in a single-electron quantum dot. Phys. Rev. Lett., 106 (12). 126801

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We report the observation of nonadiabatic excitations of single electrons in a quantum dot. Using a tunable-barrier single-electron pump, we have developed a way of reading out the excitation spectrum and level population of the dot by using the pump current as a probe. When the potential well is deformed at subnanosecond time scales, electrons are excited to higher levels. In the presence of a perpendicular magnetic field, the excited states follow a Fock-Darwin spectrum. Our experiments provide a simple model system to study nonadiabatic processes of quantum particles.

Item Type: Article
Keywords: nonadiabatic excitation, single-electron pump, quantum dot, Fock-Darwin spectrum, current quantisation
Subjects: Quantum Phenomena
Quantum Phenomena > Nanophysics
Identification number/DOI: 10.1103/PhysRevLett.106.126801
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/4939

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