How much topological insulation does one need? how much can one get?

Akhlesh Lakhtakia, Tom G. Mackay, Francesco Chiadini, Annunziata Diovisalvi, Vincenzo Fiumara, Antonio Scaglione

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Topological insulators (TIs) have taken electromagnetic-engineering research by a storm this decade, and numerous theoretical papers have been published after modeling a TI as a nonreciprocal biisotropic material. As the TI phenomenon macroscopically is manifested only at boundaries, the assumed nonreciprocity in the bulk is fallacious. The TI phenomenon is better accommodated as a boundary condition indicating the presence of conducting states of a specific type. Theory shows that the TI effects in the free space surrounding a region occupied by a TI material do not depend on the specific model chosen. We have collectively examined frequency-domain scattering by planar surfaces, TI-coated gratings, and spheres in order to answer the first question in the title of this presentation. Our answer is: a lot. Based on a review of experimental data available on a variety of chalcogenide TIs, our answer to the second question in the title of this presentation is: much less.

Original languageEnglish (US)
Title of host publicationProceedings of the 2017 19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages729-732
Number of pages4
ISBN (Electronic)9781509044511
DOIs
StatePublished - Oct 11 2017
Event19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017 - Verona, Italy
Duration: Sep 11 2017Sep 15 2017

Other

Other19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017
CountryItaly
CityVerona
Period9/11/179/15/17

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Instrumentation
  • Radiation

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  • Cite this

    Lakhtakia, A., Mackay, T. G., Chiadini, F., Diovisalvi, A., Fiumara, V., & Scaglione, A. (2017). How much topological insulation does one need? how much can one get? In Proceedings of the 2017 19th International Conference on Electromagnetics in Advanced Applications, ICEAA 2017 (pp. 729-732). [8065351] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICEAA.2017.8065351