Tunable Nonadiabatic Excitation in a Single-Electron Quantum Dot

被引：61
|
作者：
Kataoka, M. [1 ]
Fletcher, J. D. [1 ]
See, P. [1 ]
Giblin, S. P. [1 ]
Janssen, T. J. B. M. [1 ]
Griffiths, J. P. [2 ]
Jones, G. A. C. [2 ]
Farrer, I. [2 ]
Ritchie, D. A. [2 ]
机构：
[1] Natl Phys Lab, Teddington TW11 0LW, Middx, England
[2] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
来源：
PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 12期
基金：
英国工程与自然科学研究理事会;
关键词：
LASER-PULSES; SPIN; FIELD;
D O I：
10.1103/PhysRevLett.106.126801
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：4
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