Nuclear effects in ultrafast quantum-well spin-dynamics

Malinowski, A.; Brand, Martin; Harley, R. T.

doi:10.1016/s1386-9477(01)00044-3

Cited by 22 publications

(30 citation statements)

References 17 publications

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“…The dynamic nuclear spin polarization, in turn, affects the electron spin dynamics. Experimental studies involve continuous [3,302] and time-resolved [311,[539][540][541] measurements of electron spin dynamics to reveal the nuclear spin dynamics.…”

Section: Carrier Spin Relaxation At Low Temperature In the Insulatingmentioning

confidence: 99%

Spin dynamics in semiconductors

2010

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This article reviews the current status of spin dynamics in semiconductors which has achieved a lot of progress in the past years due to the fast growing field of semiconductor spintronics. The primary focus is the theoretical and experimental developments of spin relaxation and dephasing in both spin precession in time domain and spin diffusion and transport in spacial domain. A fully microscopic many-body investigation on spin dynamics based on the kinetic spin Bloch equation approach is reviewed comprehensively.Comment: a review article with 193 pages and 1103 references. To be published in Physics Reports

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Section: Carrier Spin Relaxation At Low Temperature In the Insulatingmentioning

confidence: 99%

Spin dynamics in semiconductors

2010

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“…Measurements in GaAs bulk [43] and in single quantum wells [44,45] have shown that there are essentially two ways of polarizing the nuclear spins. Either directly via the Fermi contact Hamiltonian.…”

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confidence: 99%

“…Either directly via the Fermi contact Hamiltonian. This is very efficient for localized electrons and leads to build-up times in the order of seconds for 50% of the achievable nuclear polarization detected in a single quantum well [45]. Nuclear spins in bulk or quantum wells that are not directly in contact with polarized electrons are polarized via spin diffusion between identical isotopes.…”

mentioning

confidence: 99%

“…Using the polarized nuclei in the GaAs quantum dots as a source for polarizing the nuclear spins in the surrounding AlGaAs matrix via spin diffusion might not be very effective, as the spin diffusion measurement of Malinowski et al [45] between two GaAs quantum wells separated by AlGaAs barriers show. Also in our case the spin diffusion rate from the GaAs dot into the AlGaAs barriers via spin flips of like isotopes which do not involve energy interchange with the lattice will be reduced due to additional quadrupolar splittings, for example due to Al inclusion.…”

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confidence: 99%

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Optical orientation of electron and nuclear spins in strain free GaAs quantum dots grown by droplet epitaxy

Belhadj

Kuroda

Simon

et al. 2009

Physica Status Solidi (b)

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We report optical orientation experiments in individual, strain free GaAs quantum dots in AlGaAs grown by modified droplet epitaxy. Circularly polarized optical excitation yields strong circular polarization of the resulting photoluminescence at 4 K. Optical injection of spin polarized electrons into the dot gives rise to dynamical nuclear polarization that considerably changes the exciton Zeeman splitting (Overhauser shift). We show that the created nuclear polarization is bistable and present a direct measurement of the build‐up time of the nuclear polarization in a single GaAs dot in the order of a second. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…Nuclear spin diffusion decreases with the dimensionality [6] of the system. Earlier estimates [7] show that nuclear spin relaxation times in conventional pure semiconductors are very long.…”

mentioning

confidence: 99%

Spin-engineered quantum dots

Fleurov¹,

Иванов²,

Peeters³

et al. 2002

Physica E: Low-dimensional Systems and Nanostructures

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Spatially nonhomogeneously spin polarized nuclei are proposed as a new mechanism to monitor electron states in a nanostructure, or as a means to createn and, if necessary, reshape such nanostructures in the course of the experiment. We found that a polarization of nulear spins may lift the spin polarization of the electron states in a nanostructure and, if sufficiently strong, leads to a polarization of the electron spins. Polarized nuclear spins may form an energy landscape capable of binding electrons with energy up to several meV and the localization radius > 100Å.

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Nuclear effects in ultrafast quantum-well spin-dynamics

Cited by 22 publications

References 17 publications

Spin dynamics in semiconductors

Spin dynamics in semiconductors

Optical orientation of electron and nuclear spins in strain free GaAs quantum dots grown by droplet epitaxy

Spin-engineered quantum dots

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