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
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