Magneto-Raman spectroscopy of spin-density excitations in (001)-grown GaAs-AlGaAs quantum wells in the regime of the persistent spin helix

S. Gelfert; C. Frankerl; C. Reichl; D. Schuh; G. Salis; W. Wegscheider; D. Bougeard; T. Korn; C. Schüller

doi:10.1117/12.2320205

20 September 2018 Magneto-Raman spectroscopy of spin-density excitations in (001)-grown GaAs-AlGaAs quantum wells in the regime of the persistent spin helix

S. Gelfert, C. Frankerl, C. Reichl, D. Schuh, G. Salis, W. Wegscheider, D. Bougeard, T. Korn, C. Schüller

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 1073219 (2018) https://doi.org/10.1117/12.2320205
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

We present inelastic light scattering experiments on low-energy intrasubband spin-density excitations (SDE) in 12-nm-wide (001)-oriented GaAs-AlGaAs single quantum well samples with balanced Rashba and Dresselhaus spin-orbit interaction strengths. This unique symmetry causes an effective spin-orbit field either parallel or antiparallel to specific in-plane crystal directions, which supports the persistent spin helix. This results in a highly anisotropic splitting of intrasubband SDEs in the conduction band. Measurements are performed in backscattering geometry, where the SDE is formed by spin-flip intrasubband transitions. A wave-vector transfer into the two-dimensional electron system is realized by tilting the sample. By rotating the sample with a rotary stage, we can precisely map the anisotropic spin splitting, which appears for various crystal directions as a double peak line shape of the spectra. In the presence of external magnetic fields, a superposition of both, the intrinsic spin-orbit field and the external magnetic field, occurs. We analyze our experimental spectra via a lineshape analysis, based on the Lindhard-Mermin lineshape, including the effects of the anisotropic spin splitting and the external magnetic field. This allows us to quantitatively deduce the spin-orbit parameters, the electron g factor, and the single-particle relaxation time from our observations.

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S. Gelfert, C. Frankerl, C. Reichl, D. Schuh, G. Salis, W. Wegscheider, D. Bougeard, T. Korn, and C. Schüller "Magneto-Raman spectroscopy of spin-density excitations in (001)-grown GaAs-AlGaAs quantum wells in the regime of the persistent spin helix", Proc. SPIE 10732, Spintronics XI, 1073219 (20 September 2018); https://doi.org/10.1117/12.2320205

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KEYWORDS

Crystals

Quantum wells

Magnetism

Spectroscopy

Raman spectroscopy

Light scattering

Backscatter

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