Presentation Information

[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 Kohda1,4,5,6 (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)


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.