Nucleation and annihilation of vortices at antidots as well as their guided motion between antidots are of the key
issues in the current efforts to design methods for controlling the vortex manipulation in micropatterned thin
films. An adaptive numerical approach has been developed on the basis of the time dependent Ginzburg-Landau
equations in order to describe the generation and motion of vortices in YBCO films with antidots. Numerical
analysis was performed of the distributions of the order parameter and the current density in superconducting
films with different patterns of antidots (up to 32). The optimisation of the guided motion of vortices requires
data on the specific distributions of the current density and the order parameter in samples with large number
of antidots.
V. Fomin, V. Gladilin, J. Devreese, J. Blokland, P. C. Christianen, J. Maan, A. Taboada, D. Granados, J. García, N. A. J. Kleemans, H. C. van Genuchten, M. Bozkurt, P. Koenraad
Theoretical analysis of the electron energy spectrum and the magnetization in a strained InxGa1-xAs/GaAs selfassembled
quantum ring (SAQR) is performed using realistic parameters, determined from the cross-sectional
scanning-tunneling microscopy characterization. The Aharonov-Bohm oscillations in the persistent current have
been observed in low temperature magnetization measurements on these SAQRs. The effect of the Coulomb
interaction on the energy spectra of SAQRs is studied for rings with two electrons and with an exciton. Our
analysis of the photoluminescence spectrum in magnetic fields up to 30 T shows that the excitonic properties
strongly depend on the anisotropic shape, size, composition and strain of the SAQRs and is in a good agreement
with the experimental data.
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