Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 97: Spintronics (joint session HL/TT)

TT 97.4: Vortrag

Donnerstag, 15. März 2018, 15:45–16:00, EW 201

Magneto-Raman spectroscopy and theoretical modelling of spin-density excitations in (001)-grown GaAs-AlGaAs quantum wells — •Sven Gelfert¹, Christian Frankerl¹, Christian Reichl², Dieter Schuh¹, Werner Wegscheider², Dominque Bougeard¹, Tobias Korn¹, and Christian Schüller¹ — ¹Institut für Experimentelle und Angewandte Physik, Universität Regensburg, 93040 Regensburg, Germany — ²Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Schweiz

We performed inelastic light scattering experiments on 12-nm-wide (001)-oriented GaAs-AlGaAs single quantum well samples in the presence of an external applied magnetic field. The investigated systems are Si doped to obtain a balanced Rashba and Dresselhaus SOI contribution (α=β). The resulting effective spin-orbit field is either parallel or antiparallel to the relevant in-plane crystal directions which leads to a highly anisotropic spin splitting of intrasubband transitions in the conduction band.

In order to get deailed insights on the behavior of the spin splitting we perform magnetic field series in different crystal directions. The intrinsic spin-orbit field strength and the electron g-factor can be deducted from our observations. We also provide theoretical considerations which quantitatively predict the modified spin splitting under these experimental conditions.