Zrenner, Artur and Markmann, Markus and Paassen, A. and Efros, A. L. and Bichler, Max and Wegscheider, Werner and Bohm, G. and Abstreiter, Gerhard (1998) Spatially resolved magneto-optics on confined systems. Physica B Condensed Matter 256-25, pp. 300-307.
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We report about spatially resolved magneto-optical experiments on two different confined semiconductor systems. Using near-field spectroscopy through AFM-written shadow masks we have investigated the optical properties of single self-assembled InGaAs quantum dots as a function of excitation power and magnetic field. This allows us to identify and fully resolve diamagnetic/orbital effects and the Zeeman splitting in the ground state and excited state of a given quantum dot. Further we report on the transport properties of minority holes in a high mobility two-dimensional electron gas at finite electric fields and high magnetic fields. Making use of spatially resolved optical excitation and detection we study the propagation of optically excited minority holes within the sea of a drifting two-dimensional electron gas. At high magnetic fields we observe an E × B drift of holes which is dominated by the Hall-field of the electron gas. At the edge of the Hall-bar, we observe edge state transport of holes via skipping orbits opposite to the direction of the initial E × B drift.
|Date:||2 December 1998|
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|Keywords:||Self-assembled quantum dots; Magneto-optics; Electron–hole transport; Edge channels|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||09 Nov 2009 13:23|
|Last Modified:||20 Jul 2011 22:07|