Local dynamic nuclear polarization using quantum point contacts

Journal Article · Mon Aug 15 00:00:00 EDT 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.73.1011· OSTI ID:6981447

Wald, K R; Kouwenhoven, L P; McEuen, P L ^[1]; van der Vaart, N C ^[2]; Foxon, C T ^[3]

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1. Department of Physics, University of California, and Materials Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
2. Department of Applied Physics, Delft University of Technology, 2600 GA Delft (Netherlands)
3. Philips Research Laboratories, Redhill, Surrey RH15HA (United Kingdom)

We have used quantum point contacts (QPCs) to locally create and probe dynamic nuclear polarization (DNP) in GaAs heterostructures in the quantum Hall regime. DNP is created via scattering between spin-polarized Landau level electrons and the Ga and As nuclear spins, and it leads to hysteresis in the dc transport characteristics. The nuclear origin of this hysteresis is demonstrated by nuclear magnetic resonance (NMR). Our results show that QPCs can be used to create and probe local nuclear spin populations, opening up new possibilities for mesoscopic NMR experiments.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6981447
• Journal Information: Physical Review Letters; (United States), Vol. 73:7; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
NUCLEAR MAGNETIC RESONANCE
ELECTRIC CONDUCTIVITY
ELECTRON GAS
HALL EFFECT
HETEROJUNCTIONS
SCATTERING
SPIN FLIP
ELECTRICAL PROPERTIES
FLUIDS
GASES
JUNCTIONS
MAGNETIC RESONANCE
PHYSICAL PROPERTIES
RESONANCE
SEMICONDUCTOR JUNCTIONS
360606* - Other Materials- Physical Properties- (1992-)
665100 - Nuclear Techniques in Condensed Matter Physics - (1992-)