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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)

- Chi-Shung Tang, Shu-Ting Tseng, Vidar Gudmundsson, Shun-Jen Cheng
- Journal of physics. Condensed matter : an…
- 2015

We investigate double finger gate (DFG) controlled spin-resolved resonant transport properties in an n-type quantum channel with a Rashba-Zeeman (RZ) subband energy gap. By appropriately tuning the DFG in the strong Rashba coupling regime, resonant state structures in conductance can be found that are sensitive to the length of the DFG system. Furthermore,… (More)

- Nzar Rauf Abdullah, Chi-Shung Tang, Andrei Manolescu, Vidar Gudmundsson
- Journal of physics. Condensed matter : an…
- 2015

We investigate coherent electron-switching transport in a double quantum waveguide system in a perpendicular static or vanishing magnetic field. The finite symmetric double waveguide is connected to two semi-infinite leads from both ends. The double waveguide can be defined as two parallel finite quantum wires or waveguides coupled via a window to… (More)

- Anna Sitek, Mugurel Ţolea, Marian Niţă, Llorenç Serra, Vidar Gudmundsson, Andrei Manolescu
- Scientific reports
- 2017

We study Coulomb interacting electrons confined in polygonal quantum rings. We focus on the interplay of localization at the polygon corners and Coulomb repulsion. Remarkably, the Coulomb repulsion allows the formation of in-gap states, i.e., corner-localized states of electron pairs or clusters shifted to energies that were forbidden for non-interacting… (More)

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

We investigate the effects of the shape of quantum dots on their far-infrared absorption in an external magnetic field by a model calculation. We focus our attention on dots with a parabolic confinement potential deviating from the common circular symmetry, and dots having circular doughnut shape. For a confinement where the generalized Kohn theorem does… (More)

- Tomas Orn Rosdahl, Andrei Manolescu, Vidar Gudmundsson
- Nano letters
- 2015

We model a core-shell nanowire (CSN) by a cylindrical surface of finite length. A uniform magnetic field perpendicular to the axis of the cylinder forms electron states along the lines of zero radial field projection, which can classically be described as snaking states. In a strong field, these states converge pairwise to quasidegenerate levels, which are… (More)

- Anna Sitek, Gunnar Thorgilsson, Vidar Gudmundsson, Andrei Manolescu
- 2016 18th International Conference on Transparent…
- 2016

We compare energy levels, carrier localization and optical absorption of a single electron and a pair of interacting carriers confined in a hexagonal quantum ring. We show that many-body levels are multiple degenerate and, contrary to the single-particle case, no repeated energy sequence can be identified. The number of eigenvalues associated with… (More)

- Olafur Jonasson, Chi-Shung Tang, Hsi-Sheng Goan, Andrei Manolescu, Vidar Gudmundsson
- Physical review. E, Statistical, nonlinear, and…
- 2012

We outline a rigorous method which can be used to solve the many-body Schrödinger equation for a Coulomb interacting electronic system in an external classical magnetic field as well as a quantized electromagnetic field. Effects of the geometry of the electronic system as well as the polarization of the quantized electromagnetic field are explicitly taken… (More)

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