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Symmetry of magnetoconductance fluctuations of quantum dots in the nonlinear response regime

Löfgren, Anneli LU ; Marlow, CA ; Humphrey, TE ; Shorubalko, I ; Taylor, RP ; Omling, Pär LU ; Newbury, R ; Lindelof, PE and Linke, H (2006) In Physical Review B (Condensed Matter and Materials Physics) 73(23).
Abstract
We investigate the symmetry of magnetoconductance fluctuations of phase-coherent, two-terminal quantum dots in the nonlinear regime of transport. Specifically, we consider open, ballistic quantum dots (electron billiards) with and without symmetry axes parallel and perpendicular to the current direction and formulate a set of novel symmetry relations not observed in devices with lower symmetry. We experimentally confirm these relations, demonstrating that high-quality materials and modern semiconductor technology allow the fabrication of devices with almost perfect symmetry. Small deviations from the intended symmetry, presumably due to impurities and fabrication limitations, do exist and can be detected. We also take into account... (More)
We investigate the symmetry of magnetoconductance fluctuations of phase-coherent, two-terminal quantum dots in the nonlinear regime of transport. Specifically, we consider open, ballistic quantum dots (electron billiards) with and without symmetry axes parallel and perpendicular to the current direction and formulate a set of novel symmetry relations not observed in devices with lower symmetry. We experimentally confirm these relations, demonstrating that high-quality materials and modern semiconductor technology allow the fabrication of devices with almost perfect symmetry. Small deviations from the intended symmetry, presumably due to impurities and fabrication limitations, do exist and can be detected. We also take into account circuit-induced asymmetries of the measured conductance due to bias-dependent depletion and demonstrate that this effect can be experimentally distinguished from rectification effects that are due to a lack of device symmetry. Some open questions regarding the role of a magnetic field in the nonlinear regime of transport are highlighted. (Less)
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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
73
issue
23
article number
235321
publisher
American Physical Society
external identifiers
  • wos:000238696600089
  • scopus:33745085263
ISSN
1098-0121
DOI
10.1103/PhysRevB.73.235321
language
English
LU publication?
yes
id
1e1f9bea-f633-4cd3-9ddc-35e326bd12ba (old id 404387)
date added to LUP
2016-04-01 17:08:34
date last changed
2020-01-12 20:05:58
@article{1e1f9bea-f633-4cd3-9ddc-35e326bd12ba,
  abstract     = {We investigate the symmetry of magnetoconductance fluctuations of phase-coherent, two-terminal quantum dots in the nonlinear regime of transport. Specifically, we consider open, ballistic quantum dots (electron billiards) with and without symmetry axes parallel and perpendicular to the current direction and formulate a set of novel symmetry relations not observed in devices with lower symmetry. We experimentally confirm these relations, demonstrating that high-quality materials and modern semiconductor technology allow the fabrication of devices with almost perfect symmetry. Small deviations from the intended symmetry, presumably due to impurities and fabrication limitations, do exist and can be detected. We also take into account circuit-induced asymmetries of the measured conductance due to bias-dependent depletion and demonstrate that this effect can be experimentally distinguished from rectification effects that are due to a lack of device symmetry. Some open questions regarding the role of a magnetic field in the nonlinear regime of transport are highlighted.},
  author       = {Löfgren, Anneli and Marlow, CA and Humphrey, TE and Shorubalko, I and Taylor, RP and Omling, Pär and Newbury, R and Lindelof, PE and Linke, H},
  issn         = {1098-0121},
  language     = {eng},
  number       = {23},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Symmetry of magnetoconductance fluctuations of quantum dots in the nonlinear response regime},
  url          = {http://dx.doi.org/10.1103/PhysRevB.73.235321},
  doi          = {10.1103/PhysRevB.73.235321},
  volume       = {73},
  year         = {2006},
}