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Stability of vortex structures in quantum dots

Saarikoski, H; Reimann, Stephanie LU ; Rasanen, E; Harju, A and Puska, M J (2005) In Physical Review B (Condensed Matter and Materials Physics) 71(3).
Abstract
We study the stability and structure of vortices emerging in two-dimensional quantum dots in high magnetic fields. Our results obtained with exact diagonalization and density-functional calculations show that vortex structures can be found in various confining potentials. In nonsymmetric external potentials we find off-electron vortices that are localized giving rise to charge deficiency or holes in the electron density with rotating currents around them. We discuss the role of quantum fluctuations and show that vortex formation is observable in the energetics of the system. Our findings suggest that vortices can be used to characterize the solutions in high magnetic fields, giving insight into the underlying internal structure of the... (More)
We study the stability and structure of vortices emerging in two-dimensional quantum dots in high magnetic fields. Our results obtained with exact diagonalization and density-functional calculations show that vortex structures can be found in various confining potentials. In nonsymmetric external potentials we find off-electron vortices that are localized giving rise to charge deficiency or holes in the electron density with rotating currents around them. We discuss the role of quantum fluctuations and show that vortex formation is observable in the energetics of the system. Our findings suggest that vortices can be used to characterize the solutions in high magnetic fields, giving insight into the underlying internal structure of the electronic wave function. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
71
issue
3
publisher
American Physical Society
external identifiers
  • wos:000226735900138
  • scopus:15444379020
ISSN
1098-0121
DOI
10.1103/PhysRevB.71.035421
language
English
LU publication?
yes
id
8298a375-09f2-4fd5-8f4c-870bf8e7c536 (old id 254128)
date added to LUP
2007-10-05 13:46:18
date last changed
2017-01-01 07:00:44
@article{8298a375-09f2-4fd5-8f4c-870bf8e7c536,
  abstract     = {We study the stability and structure of vortices emerging in two-dimensional quantum dots in high magnetic fields. Our results obtained with exact diagonalization and density-functional calculations show that vortex structures can be found in various confining potentials. In nonsymmetric external potentials we find off-electron vortices that are localized giving rise to charge deficiency or holes in the electron density with rotating currents around them. We discuss the role of quantum fluctuations and show that vortex formation is observable in the energetics of the system. Our findings suggest that vortices can be used to characterize the solutions in high magnetic fields, giving insight into the underlying internal structure of the electronic wave function.},
  author       = {Saarikoski, H and Reimann, Stephanie and Rasanen, E and Harju, A and Puska, M J},
  issn         = {1098-0121},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Stability of vortex structures in quantum dots},
  url          = {http://dx.doi.org/10.1103/PhysRevB.71.035421},
  volume       = {71},
  year         = {2005},
}