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Magneto-Raman spectroscopy of spin-density excitations in (001)-grown GaAs-AlGaAs quantum wells in the regime of the persistent spin helix
Author(s): S. Gelfert; C. Frankerl; C. Reichl; D. Schuh; G. Salis; W. Wegscheider; D. Bougeard; T. Korn; C. Schüller
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Paper 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.

Paper Details

Date Published: 20 September 2018
PDF: 6 pages
Proc. SPIE 10732, Spintronics XI, 1073219 (20 September 2018); doi: 10.1117/12.2320205
Show Author Affiliations
S. Gelfert, Univ. Regensburg (Germany)
C. Frankerl, Univ. Regensburg (Germany)
C. Reichl, ETH Zurich (Switzerland)
D. Schuh, Univ. Regensburg (Germany)
G. Salis, IBM Research - Zürich (Switzerland)
W. Wegscheider, ETH Zurich (Switzerland)
D. Bougeard, Univ. Regensburg (Germany)
T. Korn, Univ. Regensburg (Germany)
C. Schüller, Univ. Regensburg (Germany)

Published in SPIE Proceedings Vol. 10732:
Spintronics XI
Henri-Jean Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi; Henri Jaffrès, Editor(s)

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