Phase velocity of drifting spin wave packets in semiconductor two-dimensional electron gas

Yusuke Tanaka, Yoji Kunihashi, Haruki Sanada, Hideki Gotoh, Koji Onomitsu, Makoto Kohda, Junsaku Nitta, Tetsuomi Sogawa

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We investigated the drift and diffusion dynamics of spin wave packets under spin-orbit effective magnetic fields in two-dimensional electron systems. A simplified model with a spin drift-diffusion equation predicted that the spin phase velocity will change over time from a large negative value to a small positive value. Kerr rotation microscopy revealed the trend we expected for the phase velocity in spin wave packets in a GaAs quantum well. Monte-Carlo simulations agreed with the experiment and showed that the phase velocity can be simply characterized by the spin-orbit parameters and the size ratio between the instantaneous and initial wave packets.

Original languageEnglish
Article number013001
JournalApplied Physics Express
Volume12
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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