講演情報
[8a-E207-2]Multiplexed generation and wavevector-selective filtering of electron spin waves in a GaAs/AlGaAs two-dimensional electron gas
〇Keito Kikuchi1, Keita Suzuki1, Jun Ishihara1, Sota Yamamoto1, Daiki Sekine2,1, Yuzo Ohno3, Masako Suzuki-Sakamaki1, Makoto Kohda1,2,4,5 (1.Grad. Sch. of Eng., Tohoku Univ., 2.QUARC, QST, 3.Univ. of Tsukuba, 4.AIMR, Tohoku Univ., 5.CSIS, Tohoku Univ.)
キーワード：
Spin-orbit interaction、Persistent spin helix、Time-resolved Kerr rotation
Electron spin waves are promising information carriers in semiconductor spintronic systems. Here, we demonstrate programmable multiplexed generation of electron spin waves with distinct wavevectors in a (001)-oriented GaAs/AlGaAs quantum well using a spatial light modulator (SLM). The resulting spin dynamics are investigated by spatially and time-resolved Kerr rotation microscopy at 15 K.Fourier analysis shows that wavevector components exhibit different decay rates: modes near the persistent spin helix (PSH) wavevector persist longer, whereas off-resonant modes decay rapidly. Consequently, an initially multiplexed spin-wave packet evolves toward a single dominant mode. These results demonstrate wavevector-selective filtering of electron spin waves and provide a platform for spin-wave multiplexing and manipulation.