Nonlocal sidewall response and deviation from exact quantization of the topological magnetoelectric effect in axion-insulator thin films
نویسندگان
چکیده
Topological insulator (TI) thin films with surface magnetism are expected to exhibit a quantized anomalous Hall effect (QAHE) when the magnetizations on top and bottom surfaces parallel, topological magnetoelectric (QTME) have opposing orientations (axion-insulator phase) sufficiently thick. We present unified picture of both effects that associates deviations from exact quantization QTME caused by finite thickness nonlocality in sidewall current response function. Using realistic tight-binding model calculations, we show ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ TI films, axion-insulator phase reduced size exchange coupling basis states local magnetization near is strengthened. Stronger also reduces potential disorder, which unimportant for QAHE but detrimental QTME, requires Fermi energy lie inside gap at all positions.
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ژورنال
عنوان ژورنال: Physical review
سال: 2021
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevb.104.l201102