Control of spin relaxation anisotropy by spin-orbit-coupled diffusive spin motion

Iizasa, Daisuke; Aoki, Asuka; Saito, Takahito; Nitta, Junsaku; Salis, G.; Kohda, Makoto

doi:10.1103/physrevb.103.024427

Cited by 12 publications

(1 citation statement)

References 37 publications

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“…The high symmetry of the PSH uniaxial spin regime allows for a perturbative approach to measure weak (anti)-localization [41]. The spin relaxation anisotropy can be enhanced by tilting the precession angle with magnetic fields [42]. Under intense pump fields with short delay, the anisotropy might also be induced by scattering with holes [43].…”

Section: Introductionmentioning

confidence: 99%

Spin drift-diffusion for two-subband quantum wells

de Assis,

Raimondi,

Ferreira

2021

Preprint

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Controlling the spin dynamics and spin lifetimes is one of the main challenges in spintronics. To this end, the study of the spin diffusion in two dimensional electron gases (2DEGs) shows that when the Rashba and Dresselhaus spin-orbit couplings (SOC) are balanced, a persistent spin helix regime arises. There, a striped spin pattern shows a long lifetime, limited only by the cubic Dresselhaus SOC, and its dynamics can be controlled by in-plane drift fields. Here, we derive a spin diffusion equation for non-degenerate two-subbands 2DEGs. We show that the intersubband scattering rate, which is defined by the overlap of the subband densities, enters as a new nob to control the spin dynamics, and can be controlled by electric fields, being maximum for symmetric quantum wells. We find that for large intersubband couplings the dynamics follows an effective diffusion matrix given by approximately half of the subband-averaged matrices. This extra 1/2 factor arises from the Matthiessen's rule summing over the intra-and intersubband scattering rates, and leads to a reduced diffusion constant and larger spin lifetimes. We illustrate our findings with numerical solutions of the diffusion equation with parameters extracted from realistic Schrödinger-Poisson calculations.

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Section: Introductionmentioning

confidence: 99%

Spin drift-diffusion for two-subband quantum wells

de Assis,

Raimondi,

Ferreira

2021

Preprint

View full text Add to dashboard Cite

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Electro-optical control of spin-orbit coupling in AlInAs/GaInAs single and double quantum wells

Li,

Wang

et al. 2024

Physics Letters A

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Selective Rashba spin–orbit coupling manipulation in triple quantum wells

Meng,

Min,

Liu

2024

Phys. Scr.

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We explore the Rashba (α) spin-orbit coupling (SOC) manipulation in triple quantum wells (QWs) with three subbands occupied in the presence of the external gate voltage Vb. Diverse behaviors of can be demonstrated by adjusting the structural parameters of the wells. Specifically, the first (lowest) subband always has larger Rashba coupling against the variations in the structural parameters and Vb than the other subbands, conducive to spin detection. α of the second and third subbands take on dual (magnitude and sign) change owing to the regulation of the inner barrier height δ, may facilitating the realization of stretchable persistent spin helix in multiple QWs. Strikingly, α of the third subband can keep essentially zero in a wide gate range corresponding to asymmetrical QW structural configurations, by adjusting δ. However, when widening the well to a certain extent the diverse behaviors of α disappear. All these findings may shed light on selective and precise SOC control in QW systems for experiments.

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Control of spin relaxation anisotropy by spin-orbit-coupled diffusive spin motion

Cited by 12 publications

References 37 publications

Spin drift-diffusion for two-subband quantum wells

Spin drift-diffusion for two-subband quantum wells

Electro-optical control of spin-orbit coupling in AlInAs/GaInAs single and double quantum wells

Selective Rashba spin–orbit coupling manipulation in triple quantum wells

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