Article

Electronic properties of a quantum dot formed by the potentials associated with the surface acoustic wave and constrictions

National Institute of Measurement and Testing Technology, Chengdu, 610021 P.R. China
Physics of Condensed Matter (impact factor: 1.53). 04/2012; 79(3):351-356. DOI:10.1140/epjb/e2010-10603-1 pp.351-356

ABSTRACT The electronic structure of dynamic quantum dots formed
by surface acoustic waves potential and the confinement potential
produced by gate voltage has been investigated within the
spin-density-functional theory. We found the addition energy of this
kind quantum dot in general decreases as the electron number
increases, so the basic feature of the quantized acoustoelectric
current with multi-plateaus can be reproduced. The addition energy
needed for a second electron entering into the dynamic quantum dot
is found to be about 2.21 meV, which is in good agreement with
experimental estimations. Moreover, the formation of the Wigner
molecule-like states is observed when the number of electrons in the
dot exceeds three. By the calculated addition energy and the
evolution of the electron density in the presence of a magnetic
field, we also explained the influence of the magnetic field on the
acoustoelectric current appeared in the experiments.

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Keywords

addition energy
 
basic feature
 
calculated addition energy
 
confinement potential
 
dynamic quantum dot
 
dynamic quantum dots
 
electron density
 
electronic structure
 
electrons
 
experimental estimations
 
gate voltage
 
good agreement
 
second electron
 
spin-density-functional theory
 
surface acoustic waves potential
 

W. Zhang