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Nuclear magnetization in gallium arsenide quantum dots at zero magnetic field
- Source :
- Nature Communications, Nature Communications, Nature Publishing Group, 2014, 5 (1), Nature Communications, 2014, 5 (1)
- Publication Year :
- 2014
- Publisher :
- Springer Science and Business Media LLC, 2014.
-
Abstract
- Optical and electrical control of the nuclear spin system allows enhancing the sensitivity of NMR applications and spin-based information storage and processing. Dynamic nuclear polarization in semiconductors is commonly achieved in the presence of a stabilizing external magnetic field. Here we report efficient optical pumping of nuclear spins at zero magnetic field in strain-free GaAs quantum dots. The strong interaction of a single, optically injected electron spin with the nuclear spins acts as a stabilizing, effective magnetic field (Knight field) on the nuclei. We optically tune the Knight field amplitude and direction. In combination with a small transverse magnetic field, we are able to control the longitudinal and transverse components of the nuclear spin polarization in the absence of lattice strain—that is, in dots with strongly reduced static nuclear quadrupole effects, as reproduced by our model calculations.<br />Optical control of nuclear spin polarization in semiconductor quantum dots is promising for applications in NMR imaging. Sallen et al. report efficient dynamic nuclear polarization at zero magnetic field in strain-free gallium arsenide quantum dots with Knight fields dominating the nuclear quadrupole effects.
- Subjects :
- Nuclear Theory
FOS: Physical sciences
General Physics and Astronomy
7. Clean energy
Article
General Biochemistry, Genetics and Molecular Biology
Gallium arsenide
Condensed Matter::Materials Science
chemistry.chemical_compound
Magnetization
Optical physics
Nuclear magnetic resonance
Semiconductor quantum dots
Magnetic properties and materials
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Nuclear Experiment
Physics
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics]
Multidisciplinary
Condensed Matter - Mesoscale and Nanoscale Physics
Condensed matter physics
Quantum dots
General Chemistry
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Polarization (waves)
Magnetic field
Applied physics
chemistry
Optical control
Quantum dot
Quadrupole
Condensed Matter::Strongly Correlated Electrons
Subjects
Details
- ISSN :
- 20411723
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- Nature Communications
- Accession number :
- edsair.doi.dedup.....d49b27111510a37cbcaac7395f502ac2