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

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

doi:10.7567/1882-0786/aaf170

Cited by 7 publications

(1 citation statement)

References 30 publications

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“…In this study, we shed light on the dynamical response of nano-sized GaN during the excitation process owing to the potential of GaN in various electronic applications such as microwave frequency integrated circuits, lightemitting diodes, solar cells, and spin-wave devices [53][54][55]. It is reported that electrons can not move from the valence band to the conduction band until it acquires an amount of energy at least equal to the energy gap.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

A mechanism for spin electron acoustic soliton observed in a spin-polarized nanosized electron-hole plasma

Afify¹,

Iqbal²,

Murtaza³

2021

Phys. Scr.

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The formation and the characteristics of spin electron acoustic (SEA) soliton in a beam interacting spin polarized electron-hole plasma are investigated. These wavepackets are supposed to be the source of heating during the excitation process. We have used the separate spin evolution-quantum hydrodynamic (SSE-QHD) model along with Maxwell equations and derived the Korteweg-de Vries (KdV) equation by using the reductive perturbation method (RPM). We note that the larger values of beam density and spin polarization can change the soliton nature from rarefactive to compressive. Our findings may be important to understand the characteristics of localized spin dependent nonlinear waves in nanosized semiconductor devices.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

A mechanism for spin electron acoustic soliton observed in a spin-polarized nanosized electron-hole plasma

Afify¹,

Iqbal²,

Murtaza³

2021

Phys. Scr.

View full text Add to dashboard Cite

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Simultaneous evaluation of drift- and diffusion-induced spin-orbit fields in a (001) GaAs/AlGaAs two-dimensional electron gas

Saito

Aoki

Nitta

et al. 2019

Applied Physics Letters

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We experimentally investigate spatiotemporal dynamics of an electron spin ensemble in the coexistence of drift and diffusive spin motion in a (001) GaAs/AlGaAs two-dimensional electron gas. Electron spins simultaneously experience spin–orbit effective magnetic fields induced by each transport mechanism, resulting in the modulation of spin precession frequency. By employing scanning time-resolved Kerr rotation microscopy, we evaluate both drift and diffusion induced spin–orbit fields simultaneously from the spatiotemporal spin map. Based on the evaluated Rashba and Dresselhaus spin–orbit coefficients, we clarify the difference and the accuracy of the evaluated spin–orbit coefficients in each transport mechanism.

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Spin–orbit parameters derivation using single-frequency analysis of InGaAs multiple quantum wells in transient spin dynamics regime

Shida

Kawaguchi

Saito

et al. 2020

Journal of Applied Physics

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The deriving method of spin–orbit (SO) parameters using a single-frequency analysis was examined in a transient regime of diffusive spin dynamics in InGaAs/InAlAs multiple quantum wells. Transient regime of diffusive spin dynamics is the time regime when the spin precession frequency induced by SO magnetic fields decreases and changes with time. Recently, we have established a method of deriving SO parameters by scanning time-resolved Kerr rotation microscopy in this transient regime [Kawaguchi et al., Appl. Phys. Lett. 115, 172406 (2019)] using the time-dependent spin precession frequency analysis. Although reliable SO parameters were derived, time-independent single-frequency analysis is still attractive because of its simplicity. In this paper, SO parameters’ derivation was performed by the single-frequency analysis comparing the experiment and the Monte Carlo (MC) simulation. The best fit of the simulation to the measurement for the SO-induced frequency yields the derivation of SO parameters; however, the derived values were different from the reliable SO parameters derived by the time-dependent analysis. This discrepancy arises from a spin relaxation time difference between the experiment and MC simulation. After intentionally adjusting the spin relaxation time of the MC simulation to the experiment, the SO-induced frequency obtained by the MC simulation with reliable SO parameters reproduced the experiment well. We found that the spin relaxation time adjustment of the MC simulation to the experiment is necessary to obtain accurate SO parameters from the single-frequency analysis comparing the experiment with the MC simulation.

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

Cited by 7 publications

References 30 publications

A mechanism for spin electron acoustic soliton observed in a spin-polarized nanosized electron-hole plasma

A mechanism for spin electron acoustic soliton observed in a spin-polarized nanosized electron-hole plasma

Simultaneous evaluation of drift- and diffusion-induced spin-orbit fields in a (001) GaAs/AlGaAs two-dimensional electron gas

Spin–orbit parameters derivation using single-frequency analysis of InGaAs multiple quantum wells in transient spin dynamics regime

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