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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, Laurence; Granados, Daniel CSIC ORCID; García Martínez, Jorge Manuel CSIC ORCID CVN ; Henini, M.; Rudenkov, V. V.; Christianen, P.C.M.; Maan, J. C.; Offermans, P.; Koenraad, P. M.; Hill, G. | Palabras clave: | Quantum dot Magnetotunneling Quantum ring |
Fecha de publicación: | may-2006 | Editor: | Elsevier | Citación: | Physica E 32(1-2): 57-60 (2006) | 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). | Versión del editor: | http://dx.doi.org/10.1016/j.physe.2005.12.014 | URI: | http://hdl.handle.net/10261/31978 | DOI: | 10.1016/j.physe.2005.12.014 | ISSN: | 1386-9477 |
Aparece en las colecciones: | (IMN-CNM) Artículos |
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