Abstract
Under broken time-reversal symmetry, a single species of 2D Dirac fermions simultaneously breaks 2D parity symmetry, which gives rise to half-integer quantization of Hall conductance as a manifestation of the parity anomaly in quantum field theory. In this chapter, we demonstrate the half-integer quantization in a synthetic heterostructure termed a semi-magnetic topological insulator, where only one surface state is gapped by magnetic do** and the opposite one is non-magnetic and gapless. We observe the half-integer quantization in Faraday and Kerr rotations as well as Hall conductivity in dc transport at zero magnetic field. Our results open a way for studying unconventional phenomena enabled by a single Dirac fermion.
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Mogi, M. (2022). Half-Integer Quantized Electrodynamics in 3D Topological Insulator. In: Quantized Phenomena of Transport and Magneto-Optics in Magnetic Topological Insulator Heterostructures. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-19-2137-7_6
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DOI: https://doi.org/10.1007/978-981-19-2137-7_6
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