Interlayer diffusion of nuclear spin polarization in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>ν</mml:mi><mml:mo>=</mml:mo><mml:mfrac><mml:mn>2</mml:mn><mml:mn>3</mml:mn></mml:mfrac></mml:mrow></mml:math>quantum Hall states

Nguyen, Minh-Hai; Tsuda, S.; Terasawa, D.; Fukuda, Akira; Zheng, Yangdong; Sawada, A.

doi:10.1103/physrevb.89.041403

Cited by 5 publications

(8 citation statements)

References 36 publications

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“…Then, variation of the longitudinal resistances of the QWs is used to detect the nuclear-spin polarization [22][23][24][25][26]. In such a manner, Nguyen et al [20] obtained a nuclear-spin-diffusion coefficient of about 15nm 2 /s, which is consistent with the value measured optically for bulk GaAs [9]. In their study, the nuclear polarization inside the QWs after DNP is assumed to be homogeneous.…”

Section: Introductionmentioning

confidence: 55%

“…As discussed above, our results are different from those presented in Ref. [20]. In our measurement sequences, the nuclear-spin distribution in the two QWs is initialized after every R b xx measurement, and one-shot measurement is performed to exclude hyperfine interaction [30].…”

Section: Discussionmentioning

confidence: 99%

“…Recently, double quantum wells (QWs) have been used to measure nuclear-spin diffusion directly [18][19][20]. In double QWs, nuclear spins are polarized in one of the two QWs (namely, the gpolarization QWh), and the nuclear-spin polarization caused by diffusion from the polarization QW can be detected in the other QW (namely, the gdetection QWh).…”

Section: Introductionmentioning

confidence: 99%

“…In spite of the advantage of an inhomogeneous nuclear-spin distribution in a study of anisotropic nuclear-spin diffusion, this advantage was ignored in Ref. [20]. Furthermore, in their experiment, it was difficult to avoid modifying the nuclear-spin diffusion by electrons existing in the QWs caused by an artifact arising from multi-measurement of the longitudinal resistance (see the Appendix A).…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic nuclear-spin diffusion in double quantum wells

Hatano

Kume

Watanabe³

et al. 2015

Phys. Rev. B

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Nuclear-spin diffusion in double quantum wells (QWs) is examined by using dynamic nuclear polarization (DNP) at a Landau level filling factor $\nu=2/3$ spin phase transition (SPT). The longitudinal resistance increases during the DNP of one of the two QW (the polarization QW) by means of a large applied current and starts to decrease just after the termination of the DNP. On the other hand, the longitudinal resistance of the other QW (the detection QW) continuously increases for approximately 2h after the termination of the DNP of the polarization QW. It is therefore concluded that the nuclear spins diffuse from the polarization QW to the detection QW. The time evolution of the longitudinal resistance of the polarization QW is explained mainly by the nuclear-spin diffusion in the in-plane direction. In contrast, that of the detection QW manifests much slower nuclear diffusion in the perpendicular direction through the AlGaAs barrier.Comment: 17 pages, 5 figures, accepted for publication in Physical Review

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Section: Introductionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anisotropic nuclear-spin diffusion in double quantum wells

Hatano

Kume

Watanabe³

et al. 2015

Phys. Rev. B

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“…The nuclear polarization accumulated near the DWs is then predicted to spread in both in-plane and out-of-plane directions. So far, the current-pumped nuclear polarization in one quantum well (QW) has been detected by another closely-separated QW, which allows the study of the nuclear spin diffusion in the out-of-plane direction [16,17]. These experiments, however, incorporate little hyperfine modification to nuclear diffusion coefficients since these coefficients are mainly determined in the absence of a two-dimensional electron gas (2DEG).…”

mentioning

confidence: 99%

NMR Tracing of Hyperfine-Mediated Nuclear Spin Diffusion in Fractional Quantum Hall Domain Phases

Miyamoto¹,

Hatano²,

Watanabe³

et al. 2016

Preprint

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We present an enhanced diffusion of nuclear spin polarization in fractional quantum Hall domain phases at ν = 2/3. Resistively-detected NMR mediated by electrically driven domain-wall motion is used as a probe of local nuclear polarization, manifesting pumping-dependent signal saturation behavior. This reveals that a relatively homogeneous polarization profile spreads even to places distant from pinning centers of the domain walls. We attribute this to the fact that the pumped nuclear polarization near the domain walls rapidly diffuses into the domains where nuclei experience Knight fields on comparable levels. The anomalous enhancement of nuclear diffusion may be interpreted in terms of indirect hyperfine-mediated interaction between nuclear spins in the domains.

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Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot

et al. 2023

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The spin diffusion concept provides a classical description of a purely quantum-mechanical evolution in inhomogeneously polarized many-body systems such as nuclear spin lattices. The central spin of a localized electron alters nuclear spin diffusion in a way that is still poorly understood. Here, spin diffusion in a single GaAs/AlGaAs quantum dot is witnessed in the most direct manner from oscillatory spin relaxation dynamics. Electron spin is found to accelerate nuclear spin relaxation, from which we conclude that the long-discussed concept of a Knight-field-gradient diffusion barrier does not apply to GaAs epitaxial quantum dots. Our experiments distinguish between non-diffusion relaxation and spin diffusion, allowing us to conclude that diffusion is accelerated by the central electron spin. Such acceleration is observed up to unexpectedly high magnetic fields – we propose electron spin-flip fluctuations as an explanation. Diffusion-limited nuclear spin lifetimes range between 1 and 10 s, which is sufficiently long for quantum information storage and processing.

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Interlayer diffusion of nuclear spin polarization inν=23quantum Hall states

Cited by 5 publications

References 36 publications

Anisotropic nuclear-spin diffusion in double quantum wells

Anisotropic nuclear-spin diffusion in double quantum wells

NMR Tracing of Hyperfine-Mediated Nuclear Spin Diffusion in Fractional Quantum Hall Domain Phases

Nuclear spin diffusion in the central spin system of a GaAs/AlGaAs quantum dot

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