Terahertz Quantum Hall Effect in a Topological Insulator
arXiv:1208.1115 · doi:10.1103/PhysRevB.87.121104
Abstract
Using THz spectroscopy in external magnetic fields we investigate the low-temperature charge dynamics of strained HgTe, a three dimensional topological insulator. From the Faraday rotation angle and ellipticity a complete characterization of the charge carriers is obtained, including the 2D density, the scattering rate and the Fermi velocity. The obtained value of the Fermi velocity provides further evidence for the Dirac character of the carriers in the sample. In resonator experiments, we observe quantum Hall oscillations at THz frequencies. The 2D density estimated from the period of these oscillations agrees well with direct transport experiments on the topological surface state. Our findings open new avenues for the studies of the finite-frequency quantum Hall effect in topological insulators.
5 pages, 3 figures
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Cited by in corpus (23)
- Observation of the universal magnetoelectric effect in a 3D topological insulator
- Cyclotron Resonance Assisted Photocurrents in Surface States of a 3D Topological Insulator Based on a Strained High Mobility HgTe Film
- Spin-helical transport in normal and superconducting topological insulators
- Josephson supercurrent through the topological surface states of strained bulk HgTe
- Probing quantum capacitance in a 3D topological insulator
- Half-integer quantum Hall effect of disordered Dirac fermions at a topological insulator surface
- Universal Faraday rotation in HgTe wells with critical thickness
- Quantum Oscillations of Photocurrents in HgTe Quantum Wells with Dirac and Parabolic Dispersions
- Room temperature electrically tunable broadband terahertz Faraday effect
- High-frequency nonlinear transport and photogalvanic effects in two-dimensional topological insulators
- Topological insulators based on HgTe
- Band Structure of Two-dimensional Dirac Semimetal from Cyclotron Resonance
- Terahertz properties of Dirac fermions in HgTe films with optical doping
- One-dimensional weak antilocalization and band Berry phases in HgTe wires
- Superradiant and transport lifetimes of the cyclotron resonance in the topological insulator HgTe
- Terahertz photoresistivity of a high-mobility 3D topological insulator based on a strained HgTe film
- Resonant Faraday and Kerr effects due to in-gap states on the surface of a topological insulator
- THz Photodetector using sideband-modulated transport through surface states of a 3D Topological Insulator
- New polarization rotation and exact TEM wave solutions in topological insulators
- Transport properties of a 1000-nm HgTe film: the interplay of surface and bulk carriers
- Observation of topological Faraday and Kerr rotations in quantum anomalous Hall state by terahertz magneto-optics
- Nonstandard transition GUE-GOE for random matrices and spectral statistics of graphene nanoflakes
- Maximal Axion Optical Chirality Enabled by Degenerate Quasibound States in the Continuum