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This study explores the relationship between spin diffusion, spin lifetime, electron density and lateral spatial confinement in two-dimensional electron gases hosted in GaAs quantum wells. Using time-resolved magneto-optical Kerr effect microscopy, we analyze how Hall-bar channel width and back-gate voltage modulation influence spin dynamics. The results reveal that the spin diffusion coefficient increases with reduced channel widths, a trend further amplified at lower electron concentrations achieved via back-gate voltages, where it increases up to 150% for the narrowest channels. The developed theoretical model confirms the spatial inhomogeneities in the spin diffusion as arising from electron-density variations within the channels. The results underscore the importance of tuning electron density and spatial geometry to optimize spin transport and coherence, providing valuable design considerations for spintronic devices where efficient spin manipulation is crucial.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: GaAs, Quantum well, Spin

Date published: 2025-05-14

Publisher: AIP Publishing

Journal:

• Journal of Applied Physics (ISSN: 00218979) vol. 137 issue. 18

Funding:

• Ministry of Education, Culture, Sports, Science and Technology 19H05603
• Ministry of Education, Culture, Sports, Science and Technology 21H05182
• Ministry of Education, Culture, Sports, Science and Technology 21H05188
• Government of Spain under Severo Ochoa CEX2019-000910-S [MCIN/AEI/10.13039/501100011033]
• Postdoctoral fellowship Beatriu de Pinos 2023 BP 00136)
• Ministry of Education, Culture, Sports, Science and Technology 24H00399

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1063/5.0257898

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Updated at: 2025-05-12 16:30:12 +0900

Published on MDR: 2025-05-12 16:18:55 +0900