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Photo-Induced Topological Superconductor in Silicene, Germanene, and Stanene

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Abstract

We investigate the emergence of topological superconductivity in honeycomb system such as silicene, germanene, and stanene. Photo-irradiation induces the Haldane term into the system. By introducing s-wave superconductivity by proximity coupling, the system becomes a topological superconductor. It is a photo-induced topological superconductor. We explicitly determine the topological phase diagram by deriving the four independent 2-band theory and determining the chern number. We also explicitly obtain wave functions of Majorana zero-energy bound states, which appear at the boundary of two distinct topological phases. We can arbitrarily control the position of Majorana fermion by moving the area of photo-irradiation.

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Acknowledgments

I am very much grateful to N. Nagaosa, Y. Tanaka and T. Oka for many helpful discussions on the subject. This work was supported in part by Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture No. 25400317.

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Authors and Affiliations

  1. Department of Applied Physics, University of Tokyo, Hongo 7-3-1, Tokyo, 113-8656, Japan

    Motohiko Ezawa

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  1. Motohiko Ezawa
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Correspondence to Motohiko Ezawa.

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Ezawa, M. Photo-Induced Topological Superconductor in Silicene, Germanene, and Stanene. J Supercond Nov Magn 28, 1249–1253 (2015). https://doi.org/10.1007/s10948-014-2900-x

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  • DOI: https://doi.org/10.1007/s10948-014-2900-x

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