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- Ryszard Stolarski, Anna Sitek, +6 authors David Shugar
- Biochimica et biophysica acta
- 1996

1H-NMR spectroscopy was applied to a study of the mode of interaction, in aqueous medium in the pH range 5.2-8.5 and at low and high temperatures, between several mono- and dinucleotide analogues of the mRNA cap m7GpppG and a selected tripeptide Trp-Leu-Glu, and a tetrapeptide Trp-Glu-Asp-Glu, the sequence of which corresponds to one of the suspected… (More)

- Anna Sitek, G. 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)

- 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)

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

- Anna Sitek, Miguel Urbaneja Torres, Kristinn Torfason, Vidar Gudmundsson, Andrei Manolescu
- 2017 19th International Conference on Transparent…
- 2017

We analyse theoretically the possibilities of contactless control of in-gap states formed by a pair of electrons confined in a triangular quantum ring. The in-gap states are corner-localized states associated with two electrons occupying the same corner area, and thus shifted to much higher energies than other corner states, but still they are below the… (More)

- Anna Sitek
- 2008

We calculate the linear optical response from a single quantum dot molecule and the nonlinear, four-wave-mixing response from an inhomogeneously broadened ensemble of such molecules. We show that both optical signals are affected by the coupling-dependent superradiance effect and by optical interference between the two polarizations. As a result, the linear… (More)

- Anna Sitek, G. 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)

- Anna Sitek, Pawel Machnikowski
- Microelectronics Journal
- 2009

We study theoretically selected aspects of the collective interaction between two coupled quantum dots (QDs) forming a quantum dot molecule (QDM) and the modes of the electromagnetic field, as manifested in the optical response of QDMs under various experimental conditions. Unlike atomic systems, the artificial QD structures show shape and size… (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)

- Marten Richter, Alexander Carmele, Anna Sitek, Andreas Knorr
- Physical review letters
- 2009

The Jaynes-Cummings model provides a well established theoretical framework for single electron two level systems in a radiation field. Similar exactly solvable models for semiconductor light emitters such as quantum dots dominated by many particle interactions are not known. We access these systems by a generalized cluster expansion, the photon-probability… (More)

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