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- Anna Sitek, Gunnar Thorgilsson, Vidar Gudmundsson, Andrei Manolescu
- Nanotechnology
- 2016

We present a theoretical study of the unielectronic energy spectra, electron localization, and optical absorption of triangular core-shell quantum rings. We show how these properties depend on geometric details of the triangle, such as side thickness or corners' symmetry. For equilateral triangles, the lowest six energy states (including spin) are grouped… (More)

- Manuel Vaĺın-Rodŕıguez, Antonio Puente, Llorenç Serra, Vidar Gudmundsson, Andrei Manolescu
- 2001

The dipole modes of non-parabolic quantum dots are studied by means of their current and density patterns as well as with their local absorption distribution. The anticrossing of the so-called Bernstein modes originates from the coupling with electron-hole excitations of the two Landau bands which are occupied at the corresponding magnetic fields.… (More)

- Chi-Shung Tang, Kristinn Torfason, Vidar Gudmundsson
- Computer Physics Communications
- 2011

- Vidar Gudmundsson, Chi-Shung Tang, Cosmin Mihai Gainar, Valeriu Moldoveanu, Andrei Manolescu
- Computer Physics Communications
- 2011

- Nzar Rauf Abdullah, Chi-Shung Tang, Andrei Manolescu, Vidar Gudmundsson
- Journal of physics. Condensed matter : an…
- 2016

We investigate theoretically the balance of the static magnetic and the dynamical photon forces in the electron transport through a quantum dot in a photon cavity with a single photon mode. The quantum dot system is connected to external leads and the total system is exposed to a static perpendicular magnetic field. We explore the transport characteristics… (More)

We explore the structural changes in charge the density and the electron configuration of quantum dots caused by the presence of other dots in an array, and the interaction of neighboring dots. We discuss what recent measurements and calculation of the far-infrared absorption reveal about almost isolated quantum dots and investigate some aspects of the… (More)

- Anna Sitek, Vidar Gudmundsson, Andrei Manolescu
- 2015 17th International Conference on Transparent…
- 2015

We compare energy spectra, electron localization and optical absorption of square and diamond quantum rings and analyze how sample geometry affects those features. We show that low energy levels of diamond rings form two groups delocalized between opposite corners which results in increased number of optical transitions. We also show that contacts applied… (More)

We calculate the magnetization of quantum dots deviating from circular symmetry for noninteracting electrons or electrons interacting according to the Hartree approximation. For few electrons the magnetization is found to depend on their number, and the shape of the dot. The magnetization is an ideal probe into the many-electron state of a quantum dot.… (More)

- Vidar Gudmundsson, Rolf R. Gerhardts
- 1996

The far-infrared absorption of a periodically modulated two-dimensional electron gas in a perpendicular constant magnetic field is calculated self-consistently within the Hartree approximation. For vanishing modulation the magnetoplasmon dispersion shows simple anticrossings with harmonics of the cyclotron resonance, as expected. For increasing modulation… (More)

- Thorsteinn H. Jonsson, Andrei Manolescu, +4 authors Vidar Gudmundsson
- Computer Physics Communications
- 2017