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Synthetic Axion Response with Space-Time Crystals

Filipa R. Prudêncio1,2,* and Mário G. Silveirinha1

  • 1University of Lisbon – Instituto Superior Técnico and Instituto de Telecomunicações, Avenida Rovisco Pais 1, 1049-001 Lisbon, Portugal
  • 2Instituto Universitário de Lisboa (ISCTE-IUL), Avenida das Forças Armadas 376, 1600-077 Lisbon, Portugal

  • *filipa.prudencio@lx.it.pt
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Phys. Rev. Applied 19, 024031 – Published 10 February, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.024031

Abstract

Here, we show that space-time modulations provide an exciting route to realize complex nonreciprocal couplings, and, in particular, the elusive axion response. We develop an analytical formalism to homogenize anisotropic space-time crystals in the long wavelength limit. It is found that space-time crystals with suitable glide-rotation symmetry can have a giant axion-type response, several orders of magnitude larger than in natural materials. The nonreciprocal axion response may have interesting applications in optics, for example, in electromagnetic isolation, and in addition may enable exciting forms of light-wave interactions.

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Phys. Rev. Applied 19, 024031– Published 10 February, 2023
  • Received 10 September 2022
  • Revised 9 December 2022
  • Accepted 5 January 2023
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