Temperature-Dependent Magnetotransport around ν=1/2 in ZnO Heterostructures
Abstract
The sequence of prominent fractional quantum Hall states up to ν = 5/11 around ν = 1/2 in a high-mobility two-dimensional electron system confined at oxide heterointerface (ZnO) is analyzed in terms of the composite fermion model. The temperature dependence of R_(xx) oscillations around ν = 1/2 yields an estimation of the composite fermion effective mass, which increases linearly with the magnetic field. This mass is of similar value to an enhanced electron effective mass, which in itself arises from strong electron interaction. The energy gaps of fractional states and the temperature dependence of R_(xx) at ν = 1/2 point to large residual interactions between composite fermions.
Additional Information
© 2012 American Physical Society. (Received 1 January 2012; published 1 May 2012) We would like to acknowledge fruitful discussions with Kentaro Nomura, Koji Muraki, and Lars Tiemann. This study is partially supported by the Japan Society for the Promotion of Science (JSPS) through the "Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program)," initiated by the Council for Science and Technology Policy (CSTP).Attached Files
Published - PhysRevLett.108.186803.pdf
Accepted Version - 1203.3349.pdf
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Additional details
- Eprint ID
- 102320
- Resolver ID
- CaltechAUTHORS:20200403-115231169
- Japan Society for the Promotion of Science (JSPS)
- Council for Science and Technology Policy (CSTP)
- Created
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2020-04-06Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field