Title
The optical excitonic Aharonov-Bohm effect in a few nanometer wide type-I nanoringsThe optical excitonic Aharonov-Bohm effect in a few nanometer wide type-I nanorings
Author
Faculty/Department
Faculty of Sciences. Physics
Research group
Condensed Matter Theory
Department of Physics
Department of Chemistry
Publication type
article
Publication
Warszawa,
Subject
Physics
Source (journal)
Acta physica Polonica: A: general physics, solid state physics, applied physics. - Warszawa
Volume/pages
117(2010):6, p. 974-977
ISSN
0587-4246
ISI
000280345100017
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The optical excitonic Aharonov-Bohm effect in type-1 three-dimensional (In, Ga)As/GaAs nanorings in theoretically explored. The single-particle states of the electron and the hole are extracted from the effective mass theory in the presence of inhomogeneous strain, and an exact numerical diagonalization approach is used to compute the exciton states and the oscillator strength fx for exciton recombination. We studied both the large lithographically-defined and small self-assembled rings. Only in smaller self-assembled nanorings we found optical excitonic AharonovBohm effect. Those oscillations are established by anticrossings between the optically active exciton states with zero orbital momentum. In lithographically defined rings, whose average radius is 33 nm, fx shows no oscillations, whereas in the smaller self-assembled nanoring with average radius of 11.5 nm oscillations in fx for the ground exciton state are found as function of the magnetic field that is superposed on a linear dependence. These oscillations are smeared out at finite temperature, thus photoluminescence intensity exhibits step-like variation with magnetic field even at temperature as small as 4.2 K.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/8b653a/a1e6f23a.pdf
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