[10a-N303-1~11] 10.4 Spintronics in semiconductor, topological material, superconductor, and multiferroics

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)

[10a-N303-1] [The 58th Young Scientist Presentation Award Speech] Advancing optical evaluation of persistent spin helix states in a GaAs/AlGaAs two-dimensional electron gas via programmable spin helix patterning

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

Keywords:

Spin-orbit interaction,Persistent spin helix,Time-resolved Kerr rotation

Persistent spin helix (PSH) states, which arise when Rashba and Dresselhaus spin-orbit interactions (SOIs) are balanced, offer a pathway to long-lived spin coherence in nonmagnetic semiconductors, making them promising for spintronic applications. However, conventional methods to evaluate PSH dynamics often require sample processing or magnetic fields, limiting their versatility. To address this, we previously developed a fully optical technique combining time-resolved Kerr rotation with programmable spin helix patterning using a spatial light modulator (SLM). This enables efficient extraction of SOI parameters through wavevector-dependent spin relaxation analysis. In this work, we extend the method by rotating the spin helix pattern in-plane via the SLM, allowing optical access to angular dependence of spin relaxation without mechanical rotation or sample alteration. This advancement enables orientation-sensitive evaluation of SOI anisotropy in low-dimensional semiconductor systems.