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Closed Access item 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, Jorge M.
Henini, M.
Rudenkov, V. V.
Christianen, P. C. M.
Maan, J. C.
Offermans, P.
Koenraad, P. M.
Hill, G.
Keywords:Quantum dot, Magnetotunneling, Quantum ring
Issue Date:May-2006
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
Appears in Collections:(IMM-CNM) Artículos

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