Half-integer quantum Hall effect of disordered Dirac fermions at a topological insulator surface

Abstract

The unconventional (half-integer) quantum Hall effect for a single species of Dirac fermions is analyzed. We discuss possible experimental measurements of the half-integer Hall conductance $g_{xy}$ of topological insulator surface states and explain how to reconcile Laughlin's flux insertion argument with half-integer $g_{xy}$. Using a vortex state representation of Landau Level wavefunctions, we calculate current density beyond linear response, which is in particular relevant to the topological image monopole effect. As a major result, the field theory describing the localization physics of the quantum Hall effect of a single species of Dirac fermions is derived. In this connection, the issue of (absent) parity anomaly is revisited. The renormalization group flow (RG) and the resulting phase diagram are extensively discussed. Starting values of the RG flow are given by the semiclassical conductivity tensor which is obtained from the Boltzmann transport theory of the anomalous Hall effect.

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Cited by in corpus (6)

• Half-Quantized Hall Effect and Power Law Decay of Edge Current Distribution
• Conductance fluctuations and disorder induced $\nu =0$ quantum Hall plateau in topological insulator nanowires
• Geometrically induced reversion of Hall current in a topological insulator cavity
• Transport in topological insulator nanowires
• Theory of magnetotransport in shaped topological insulator nanowires
• Pumping conductance, the intrinsic anomalous Hall effect, and statistics of topological invariants