[16p-D704-1~18] 10.4 Spintronics in semiconductor, topological material, superconductor, and multiferroics

▼ [16p-D704-2] Proposal of electron spin wave filter in semiconductor two-dimensional electron gas

〇(M1)Keito Kikuchi¹, Kai Nakajima¹, Shutaro Karube¹, Chaoliang Zhang², Makoto Kohda^1,3,4,5 (1.Grad. Sch. of Eng., Tohoku Univ., 2.FRIS, Tohoku Univ., 3.CSIS, Tohoku Univ., 4.FRiD, Tohoku Univ., 5.QUARC, QST)

Keywords:Persistent spin helix, Spin wave filter, Electron spin waves

Electron spin waves (ESWs), a spatial spin texture induced by a persistent spin helix (PSH) symmetry, are attractive as new information carriers to utilize wave properties in semiconductors. These ESWs would be useful for simultaneous information processing if we could realize multiplexing, transferring, and filtering the ESWs. Especially the filtering technique is much important for performing logic operations using the ESWs. So, in this study, we employ Monte-Carlo (MC) simulation to demonstrate the ESW filter on semiconductor two-dimensional electron gas (2DEG). The stable wavenumber of ESW is known to be q₀=±2(α+β)m*/(h/2π)². Since the relaxation rate increases in proportion to q^₂ as the wavenumber q increased from q₀, the ESW with a wavenumber close to q₀=±0.59 (1/μm) has only remained. This means that any electron spin wavelength can be filtered by adjusting the effective spin-orbit field through the gate control to modulate the Rashba parameter in an actual system.