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Título : Magnetotunneling spectroscopy of ring-shaped (InGa)As quantum dots: Evidence of excited states with 2pz character
Autor : Walker, D., Pulizzi, F., Patanè, A., Eaves, L., Granados, Daniel, García Martínez, Jorge Manuel, Henini, M., Rudenkov, V. V., Christianen, P. C. M., Maan, J. C., Offermans, P., Koenraad, P. M., Hill, G.
Palabras clave : Quantum dot
Quantum ring
Fecha de publicación : May-2006
Editor: Elsevier
Resumen: We study the effect of a high magnetic field (B) on the current–voltage characteristics, I(V), of a GaAs/(AlGa)As resonant tunneling diode incorporating a layer of ring-shaped quantum dots (QDs) in the quantum well (QW). The dots give rise to a series of four unusual resonances in I(V) which show a high degree of reproducibility across the epitaxial wafer. By combining data for B parallel and perpendicular to the growth axis z, we identify that the unusual resonances arise from resonant tunneling into QD excited states with 2pz-like symmetry. The two series of magneto-oscillations in I for Bz allow us to determine the resonant charging and discharging of the QW with varying bias.
Descripción : 4 páginas, 3 figuras.-- PACS: 73.23. b; 73.63.Kv; 73.40.Gk.-- Proceedings of the 12th International Conference on Modulated Semiconductor Structures (ICPS-12).
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ISSN: 1386-9477
DOI: 10.1016/j.physe.2005.12.014
Citación : Physica E 32(1-2): 57-60 (2006)
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