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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/31978
Title: Magnetotunneling spectroscopy of ring-shaped (InGa)As quantum dots: Evidence of excited states with 2pz character
Authors: 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.
Keywords: Quantum dot
Quantum ring
Issue Date: May-2006
Publisher: Elsevier
Citation: Physica E 32(1-2): 57-60 (2006)
Abstract: 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.
Description: 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).
Publisher version (URL): http://dx.doi.org/10.1016/j.physe.2005.12.014
URI: http://hdl.handle.net/10261/31978
ISSN: 1386-9477
DOI: 10.1016/j.physe.2005.12.014
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