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Magnetic Field-Dependent Magneto-Optical Kerr Effect in [(GeTe)2(Sb2Te3)1]8 Topological Superlattice

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Abstract

We studied the magnetic field dependence of magneto-optical Kerr rotation of the [(GeTe)2/(Sb2Te3)1]8 topological superlattice at different temperatures (from 300 K to 440 K). At low temperatures (less than 360 K), the Kerr signal was within noise level. However, large Kerr rotation peaks with a mirror symmetric loop were at high temperatures (higher than 360 K). The temperature dependence of the observed Kerr signal can be attributed to the breaking of spatial inversion symmetry, which induces a narrow gap in surface state bands due to the Ge atomic layer movement-induced phase transition in the superlattice. We found that the resonant field of each Kerr peak gradually decreases with increasing temperature. On the other hand, the phase transition from a high temperature phase to a low temperature one could be controlled by external magnetic fields.

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Acknowledgements

This work was financially supported by CREST, JST, Japan.

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Authors and Affiliations

  1. Toyota Technological Institute, 2-12-1 Hisakata, Tempaku, Nagoya, 468-8511, Japan

    Do Bang & Hiroyuki Awano

  2. CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan

    Do Bang, Hiroyuki Awano, Yuta Saito & Junji Tominaga

  3. Institute of Materials Science, VAST, 18 Hoang Quoc Viet, Hanoi, Vietnam

    Do Bang

  4. Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 4, 1-1-1 Higashi, Tsukuba, 305-8562, Japan

    Yuta Saito & Junji Tominaga

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  1. Do Bang
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  2. Hiroyuki Awano
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  3. Yuta Saito
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  4. Junji Tominaga
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Correspondence to Do Bang.

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Bang, D., Awano, H., Saito, Y. et al. Magnetic Field-Dependent Magneto-Optical Kerr Effect in [(GeTe)2(Sb2Te3)1]8 Topological Superlattice. J. Electron. Mater. 45, 2496–2500 (2016). https://doi.org/10.1007/s11664-016-4389-5

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  • DOI: https://doi.org/10.1007/s11664-016-4389-5

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