Anomalous galvanomagnetism, cyclotron resonance and microwave spectroscopy of topological insulators

Details Anomalous galvanomagnetism, cyclotron resonance and microwave spectroscopy of topological insulators Anomalous galvanomagnetism, cyclotron resonance and microwave spectroscopy of topological insulators

2010-11-11

arxiv.org/abs/1011.2756v4

Phys. Rev. B 84, 035405 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures, version as published

Scientific paper

10.1103/PhysRevB.84.035405

The surface quantum Hall state, magneto-electric phenomena and their connection to axion electrodynamics have been studied intensively for topological insulators. One of the obstacles for observing such effects comes from nonzero conductivity of the bulk. To overcome this obstacle we propose to use an external magnetic field to suppress the conductivity of the bulk carriers. The magnetic field dependence of galvanomagnetic and electromagnetic responses of the whole system shows anomalies due to broken time-reversal symmetry of the surface quantum Hall state, which can be used for its detection. In particular, we find linear bulk dc magnetoresistivity and a quadratic field dependence of the Hall angle, shifted rf cyclotron resonance, nonanalytic microwave transmission coefficient and saturation of the Faraday rotation angle with increasing magnetic field or wave frequency.

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