ESR detection of optical dynamic nuclear polarization in GaAs/AlxGa1-xAs quantum wells at unity filling factor in the quantum Hall effect

Authors
Vitkalov, SA Bowers, CR Simmons, JA Reno, JL
Citation
Sa. Vitkalov et al., ESR detection of optical dynamic nuclear polarization in GaAs/AlxGa1-xAs quantum wells at unity filling factor in the quantum Hall effect, PHYS REV B, 61(8), 2000, pp. 5447-5451
Citations number
39
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
10980121 → ACNP
Volume
61
Issue
8
Year of publication
2000
Pages
5447 - 5451
Database
ISI
SICI code
1098-0121(20000215)61:8<5447:EDOODN>2.0.ZU;2-W
Abstract
This paper presents a study of the enhancement of the Zeeman energy of two- dimensional (2D) conduction electrons near the v=1 filling factor of the qu antum Hall effect by optical dynamic nuclear polarization. The change in th e Zeeman energy is determined from the Overhauser:shift of the transport de tected electron spin resonance in GaAs/AlxGa1-xAs multiquantum wells. in a separate experiment the NMR signal enhancement factor is obtained by radio frequency detected nuclear magnetic resonance under similar conditions in t he same sample. These measurements afford an estimation of the hyperfine co upling constant between the nuclei and 2D conduction electrons.