Abstract
We demonstrate experimentally that composite fermions in monolayer graphene display weak antilocalization. Our experiments deal with fractional quantum Hall (FQH) states in high-mobility, suspended graphene Corbino disks in the vicinity of . We find a strong temperature dependence of conductivity away from half filling, which is consistent with the expected electron-electron interaction-induced gaps in the FQH state. At half filling, however, the temperature dependence of conductivity becomes quite weak, as anticipated for a Fermi sea of composite fermions, and we find a logarithmic dependence of on . The sign of this quantum correction coincides with the weak antilocalization of graphene composite fermions, indigenous to chiral Dirac particles.
- Received 18 December 2016
DOI:https://doi.org/10.1103/PhysRevB.97.075113
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