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Inhomogeneous charging and screening effects in semiconductor quantum dot arrays

Wetzler, R; Kunert, R; Wacker, Andreas LU and Scholl, E (2004) In New Journal of Physics 6. p.1-81
Abstract
The electronic properties of quantum dot (QD) arrays are strongly influenced by the Coulomb interaction of electrons within the dot as well as with those in neighbouring dots. In this paper, we investigate this behaviour taking into account screening by a free electron gas in the vicinity of the QDs. We find pronounced effects for standard capacitance - voltage ( CV) measurements of QD structures embedded in a pn-diode. In particular, we show that the three-dimensional nature of the problem is crucial for devices with low dot-density, whereas the self-consistency between electron depletion in the bulk layer and dot occupation is important for high dot-densities. The Coulomb interaction between the dots induces a broadening of the peaks in... (More)
The electronic properties of quantum dot (QD) arrays are strongly influenced by the Coulomb interaction of electrons within the dot as well as with those in neighbouring dots. In this paper, we investigate this behaviour taking into account screening by a free electron gas in the vicinity of the QDs. We find pronounced effects for standard capacitance - voltage ( CV) measurements of QD structures embedded in a pn-diode. In particular, we show that the three-dimensional nature of the problem is crucial for devices with low dot-density, whereas the self-consistency between electron depletion in the bulk layer and dot occupation is important for high dot-densities. The Coulomb interaction between the dots induces a broadening of the peaks in the CV characteristic which is comparable with the effect of disordered QD arrays, where we considered realistic size and position fluctuations obtained by a kinetic Monte Carlo simulation. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
New Journal of Physics
volume
6
pages
1 - 81
publisher
IOP Publishing Ltd.
external identifiers
  • wos:000222537500003
  • scopus:4644230255
ISSN
1367-2630
DOI
10.1088/1367-2630/6/1/081
language
English
LU publication?
yes
id
9faf3825-691d-470e-bf0e-64bfdb666fd9 (old id 273155)
date added to LUP
2007-11-05 13:54:04
date last changed
2017-01-01 07:15:35
@article{9faf3825-691d-470e-bf0e-64bfdb666fd9,
  abstract     = {The electronic properties of quantum dot (QD) arrays are strongly influenced by the Coulomb interaction of electrons within the dot as well as with those in neighbouring dots. In this paper, we investigate this behaviour taking into account screening by a free electron gas in the vicinity of the QDs. We find pronounced effects for standard capacitance - voltage ( CV) measurements of QD structures embedded in a pn-diode. In particular, we show that the three-dimensional nature of the problem is crucial for devices with low dot-density, whereas the self-consistency between electron depletion in the bulk layer and dot occupation is important for high dot-densities. The Coulomb interaction between the dots induces a broadening of the peaks in the CV characteristic which is comparable with the effect of disordered QD arrays, where we considered realistic size and position fluctuations obtained by a kinetic Monte Carlo simulation.},
  author       = {Wetzler, R and Kunert, R and Wacker, Andreas and Scholl, E},
  issn         = {1367-2630},
  language     = {eng},
  pages        = {1--81},
  publisher    = {IOP Publishing Ltd.},
  series       = {New Journal of Physics},
  title        = {Inhomogeneous charging and screening effects in semiconductor quantum dot arrays},
  url          = {http://dx.doi.org/10.1088/1367-2630/6/1/081},
  volume       = {6},
  year         = {2004},
}