| Issue |
EPL
Volume 115, Number 3, August 2016
|
|
|---|---|---|
| Article Number | 37009 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/115/37009 | |
| Published online | 12 September 2016 | |
The fractional acoustoelectric current plateau induced by the energy-dependent tunnelling from dynamic quantum dots into an impurity dot
Laboratory of Mesoscopic and Low Dimensional Physics, College of Physical Science and Technology, Sichuan University - Chengdu 610064, PRC
(a) songliscu@sina.com (corresponding author)
Received: 11 April 2016
Accepted: 20 August 2016
The fractional acoustoelectric (AE) current plateau in surface-acoustic-waves (SAW) single-electron transport devices is studied by measuring the current plateau as a function of the SAW power and gate bias as well as a function of perpendicular magnetic filed. Our investigation indicates that the fractional plateau is induced by the tunnelling effect from the dynamic quantum dots (QDs) into a static impurity dot. Rate equations are used to extract the tunnelling rates, which change a lot with the number of electrons in the dynamic QDs, the SAW power and gate bias. In addition, the current plateau evolves into a fractional structure, when a strong perpendicular magnetic field is applied to the system.
PACS: 72.50.+b – Acoustoelectric effects / 73.21.La – Quantum dots / 73.23.Hk – Coulomb blockade; single-electron tunneling
© EPLA, 2016
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