[24a-71B-1~9] 10.4 Spintronics in semiconductor, topological material, superconductor, and multiferroics

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[24a-71B-1] Spatiotemporal dynamics of directly generated electron spin waves in a GaAs/AlGaAs two-dimensional electron gas by spatial light modulation

〇Keito Kikuchi¹, Miari Hiyama¹, Jun Ishihara¹, Sota Yamamoto¹, Yuzo Ohno², Takachika Mori³, Kensuke Miyajima³, Makoto Kohda^1,4,5,6 (1.Grad. Sch. of Eng., Tohoku Univ., 2.Univ. of Tsukuba, 3.Tokyo Univ. of Sci., 4.CSIS, Tohoku Univ., 5.DEFS, Tohoku Univ., 6.QUARC, QST)

Keywords:

spin-orbit interaction,two-dimensional electron gas,time-resolved Kerr rotation

In this study, researchers generated electron spin waves (ESWs) by creating a stripe pattern of circularly polarized light through spatial light modulation of pump light. The ESWs were induced in a (001)-oriented 20 nm GaAs/AlGaAs quantum well structure, where Rashba and Dresselhaus spin-orbit interactions are close to the persistent spin helix (PSH) condition. The resulting ESWs exhibited various wavenumbers, with the longest-time evolution observed at a wavenumber close to the intrinsic value determined by the spin-orbit interaction. The study demonstrated the successful generation of ESWs with arbitrary wavenumbers and a clear, long-lasting time evolution of the wave pattern.