Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 95: Spintronics: Mobile Electrons and Holes (jointly with HL, MA)

TT 95.7: Vortrag

Donnerstag, 19. März 2015, 11:45–12:00, ER 164

Inelastic light scattering in a two-dimensional electron gas under external magnetic fields — •Christoph Schönhuber, Dieter Schuh, Dominique Bougeard, Tobias Korn, and Christian Schüller — Universität Regensburg, 93040 Regensburg, Germany

We present inelastic light scattering measurements of a 12-nm-wide (001)-oriented GaAs/AlGaAs QW under external magnetic fields. The investigated system is single-side Si doped to reach a balanced Rashba and Dresselhaus SOI contribution.

The performed measurements on intrasubband transitions of the conduction band reveal for B=0 a double peak structure for the [1-1] direction due to spin splitting, while the [11] direction features only a single peak. For small magnetic fields, the wave vector appears to be conserved in the scattering process while both directions aim to assimilate the excitation with increasing field strength. At higher perpendicular magnetic fields, the anisotropic behaviour has vanished and the spectra are characterized by inter-Landau excitations.