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. 2017 May 15;8:15197. doi: 10.1038/ncomms15197

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Copyright © 2017, The Author(s)

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(a) A scheme of the experimental set-up (only one arm of the Mach–Zehnder interferometer is shown). The strained HgTe layer, which is a 3D TI, is sandwiched between (Cd,Hg)Te protecting layers. The top-gate electrode, consisting of a SiO₂/Si₃N₄ multilayer insulator and a thin conducting Ru film, is semitransparent at THz frequencies. The THz radiation (v=0.35 THz) is linearly polarized, and the Faraday rotation (θ_F) and ellipticity (η_F) are measured as a function of the magnetic field strength B for different gate voltages U_G. (b,c) Transmission spectra in the parallel and crossed polarizer configurations, respectively. The gate voltage is colour-coded, and the experimental curves are shifted for clarity. Notations in b,c: e denotes the CR of the topological surface states of electron character, s1 and s2 denote extra resonances with opposite phase to that of the e-CR as discussed in the text.

Inline graphic — (a) A scheme of the experimental set-up (only one arm of the Mach–Zehnder interferometer is shown). The strained HgTe layer, which is a 3D TI, is sandwiched between (Cd,Hg)Te protecting layers. The top-gate electrode, consisting of a SiO₂/Si₃N₄ multilayer insulator and a thin conducting Ru film, is semitransparent at THz frequencies. The THz radiation (v=0.35 THz) is linearly polarized, and the Faraday rotation (θ_F) and ellipticity (η_F) are measured as a function of the magnetic field strength B for different gate voltages U_G. (b,c) Transmission spectra in the parallel and crossed polarizer configurations, respectively. The gate voltage is colour-coded, and the experimental curves are shifted for clarity. Notations in b,c: e denotes the CR of the topological surface states of electron character, s1 and s2 denote extra resonances with opposite phase to that of the e-CR as discussed in the text.