Tunable Electron Interactions and Fractional Quantum Hall States in Graphene

Details Tunable Electron Interactions and Fractional Quantum Hall States in Graphene Tunable Electron Interactions and Fractional Quantum Hall States in Graphene

2011-02-16

arxiv.org/abs/1102.3211v2

Phys. Rev. Lett. 107, 176602 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4.2 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.107.176602

The recent discovery of fractional quantum Hall states in graphene raises the question of whether the physics of graphene and its bilayer offers any advantages over GaAs-based materials in exploring strongly-correlated states of two-dimensional electrons. Here we propose a method to continuously tune the effective electron interactions in graphene and its bilayer by the dielectric environment of the sample. Using this method, the charge gaps of prominent FQH states, including \nu=1/3 or \nu=5/2 states, can be increased several times, or reduced all the way to zero. The tunability of the interactions can be used to realize and stabilize various strongly correlated phases in the FQH regime, and to explore the transitions between them.

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