ESR Detection of optical dynamic nuclear polarization in GaAs/Al{sub x}Ga{sub 1-x}As quantum wells at unity filling factor in the quantum Hall effect

Journal Article · Tue Feb 15 04:00:00 EST 2000 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.61.5447· OSTI ID:20215513

Vitkalov, Sergey A ^[1]; Bowers, C Russell ^[1]; Simmons, Jerry A ^[2]; Reno, John L ^[2]

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1. Chemistry Department, University of Florida, Gainesville, Florida 32611-7200 (United States)
2. Sandia National Laboratories, MS 1415, Albuquerque, New Mexico 87185-1415 (United States)

This paper presents a study of the enhancement of the Zeeman energy of two-dimensional (2D) conduction electrons near the {nu}=1 filling factor of the quantum Hall effect by optical dynamic nuclear polarization. The change in the Zeeman energy is determined from the Overhauser shift of the transport detected electron spin resonance in GaAs/Al{sub x}Ga{sub 1-x}As multiquantum wells. In a separate experiment the NMR signal enhancement factor is obtained by radio frequency detected nuclear magnetic resonance under similar conditions in the same sample. These measurements afford an estimation of the hyperfine coupling constant between the nuclei and 2D conduction electrons. (c) 2000 The American Physical Society.

• OSTI ID: 20215513
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 8 Vol. 61; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM ARSENIDES
EXPERIMENTAL DATA
GALLIUM ARSENIDES
HALL EFFECT
HYPERFINE STRUCTURE
NMR SPECTRA
POLARIZATION
ZEEMAN EFFECT