Uniaxial transition dipole moments in semiconductor quantum rings caused by broken rotational symmetry

Nicolai F. Hartmann, Matthew Otten, Igor Fedin, Dmitri Talapin, Moritz Cygorek, Pawel Hawrylak, Marek Korkusinski, Stephen Gray, Achim Hartschuh () and Xuedan Ma ()
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Nicolai F. Hartmann: LMU Munich
Matthew Otten: Argonne National Laboratory
Igor Fedin: University of Chicago
Dmitri Talapin: Argonne National Laboratory
Moritz Cygorek: University of Ottawa
Pawel Hawrylak: University of Ottawa
Marek Korkusinski: National Research Council
Stephen Gray: Argonne National Laboratory
Achim Hartschuh: LMU Munich
Xuedan Ma: Argonne National Laboratory

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Semiconductor quantum rings are topological structures that support fascinating phenomena such as the Aharonov–Bohm effect and persistent current, which are of high relevance in the research of quantum information devices. The annular shape of quantum rings distinguishes them from other low-dimensional materials, and enables topologically induced properties such as geometry-dependent spin manipulation and emission. While optical transition dipole moments (TDMs) in zero to two-dimensional optical emitters have been well investigated, those in quantum rings remain obscure despite their utmost relevance to the quantum photonic applications of quantum rings. Here, we study the dimensionality and orientation of TDMs in CdSe quantum rings. In contrast to those in other two-dimensional optical emitters, we find that TDMs in CdSe quantum rings show a peculiar in-plane linear distribution. Our theoretical modeling reveals that this uniaxial TDM originates from broken rotational symmetry in the quantum ring geometries.

Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-11225-6

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DOI: 10.1038/s41467-019-11225-6

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