Zero-field spin precession dynamics of high-mobility two-dimensional electron gas in persistent spin helix regime

Jun Ishihara, Go Kitazawa, Yuya Furusho, Yuzo Ohno, Hideo Ohno, and Kensuke Miyajima

Phys. Rev. B 101, 094438 – Published 31 March 2020

Abstract

We investigated the spin-orbit (SO) effective magnetic-field-induced spin precession of a high-mobility two-dimensional electron gas (2DEG) in a modulation-doped (001) GaAs/AlGaAs quantum well close to the persistent spin helix (PSH) state. The oscillating spin signal induced by the SO fields in zero external magnetic fields was clearly observed. When the photoexcited carrier density is sufficiently small compared with the 2DEG density, the spin precession length in the space domain was obtained by analyzing the precession frequency in the PSH regime. The excitation density dependence of the spin dynamics was reproduced well using the scattering time-dependent spin dynamics simulation. We revealed that the increase in the photoexcited carriers results in a transition from ballistic motion to diffusive motion, leading to a decrease in the spin-diffusion coefficient.

Received 16 January 2020
Accepted 12 March 2020

DOI:https://doi.org/10.1103/PhysRevB.101.094438

Physics Subject Headings (PhySH)

Spin dynamics Spin-orbit coupling Spintronics

III-V semiconductors Two-dimensional electron system

Kerr effect Magneto-optical Kerr effect Time-resolved reflection spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jun Ishihara ^1,*, Go Kitazawa¹, Yuya Furusho¹, Yuzo Ohno ², Hideo Ohno³, and Kensuke Miyajima¹

¹Department of Applied Physics, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125–8585, Japan
²Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305–8573, Japan
³Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980–8577, Japan

^*j.ishihara@rs.tus.ac.jp

Article Text (Subscription Required)

Click to Expand

Supplemental Material (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 101, Iss. 9 — 1 March 2020

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review B

covering condensed matter and materials physics