Signatures of Fractional Quantum Hall States in Topological Insulators

Details Signatures of Fractional Quantum Hall States in Topological Insulators Signatures of Fractional Quantum Hall States in Topological Insulators

2011-08-23

arxiv.org/abs/1108.4483v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

The fractional quantum Hall (FQH) state is a topological state of matter resulting from the many-body effect of interacting electrons and is of vast interest in fundamental physics. Recent theoretical studies suggest that the FQH effect might be observable in topological insulators, which can host a single Dirac valley with no spin degeneracy. However, due to the dominant bulk conduction it is difficult to probe the strong correlation effect in topological insulators from resistivity measurements. Here we report the discovery of FQH states in Bi2Te3 from thermopower measurements. The surface thermopower is ten times greater than that of bulk, which makes possible the observation of fractional-filled Landau levels in surface states. Hence, thermopower provides a powerful tool to investigate correlated Dirac fermions in topological insulators.

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