期刊
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
卷 40, 期 5, 页码 1017-1021出版社
ELSEVIER
DOI: 10.1016/j.physe.2007.09.020
关键词
surface acoustic wave; quantum dot; single electron; tunnelling
资金
- Engineering and Physical Sciences Research Council [EP/D008506/1] Funding Source: researchfish
- EPSRC [EP/D008506/1] Funding Source: UKRI
We present an experimental technique for investigating the dynamics of single-electron tunnelling on a sub-nanosecond timescale without using fast gate pulses. We use surface acoustic waves (SAWs) to form dynamic quantum dots in a depleted one-dimensional channel. Each dynamic dot carries a single electron at SAW velocity similar to 2800 m/s. These dynamic dots are coupled to an open channel through a tunnel barrier for a length of similar to 1 mu m. This allows each electron to tunnel out for a duration of similar to 350ps. This fixed tunnel duration allows us to examine the dynamic nature of electron tunnelling without the need for gate pulses. Oscillations with similar to 1 % visibility are observed in the tunnel current as a function of gate voltage. We argue that these oscillations cannot be explained in the adiabatic limit, and that dynamic processes must be considered. (C) 2007 Elsevier B.V. All rights reserved.
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