Journal
SOLID STATE COMMUNICATIONS
Volume 217, Issue -, Pages 1-5Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2015.05.005
Keywords
Heterojunctions; Fractional quantum Hall effect; Electron-electron interactions; Quantum Hall effect
Categories
Funding
- NSERC
- CIFAR
- FQRNT
- Gordon and Betty Moore Foundation
- National Science Foundation MRSEC Program through the Princeton Center for Complex Materials [DMR-0819860]
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For certain measurements, the Corbino geometry has a distinct advantage over the Hall and van der Pauw geometries, in that it provides a direct probe of the bulk 2DEG without complications due to edge effects. This may be important in enabling detection of the non-Abelian entropy of the 5/2 fractional quantum Hall state via bulk thermodynamic measurements. We report the successful fabrication and measurement of a Corbino-geometry sample in an ultra-high mobility GaAs heterostructure, with a focus on transport in the second and higher Landau levels. In particular, we report activation energy gaps of fractional quantum Hall states, with all edge effects ruled out, and extrapolate sigma(0) from the Arrhenius fits. Our results show that activated transport in the second Landau level remains poorly understood. The development of this Corbino device opens the possibility to study the bulk of the 5/2 state using techniques not possible in other geometries. (C) 2015 Elsevier Ltd. All rights reserved.
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