Epsilon-near-zero response and tunable perfect absorption in Weyl semimetals

We theoretically study the electromagnetic response of type-I and type-II centrosymmetric Weyl metals. We derive an anisotropic permittivity tensor with off-diagonal elements to describe such gyrotropic media. Our findings reveal that for appropriate Weyl cones tilts, the real part of the transverse component of the permittivity can exhibit an ϵ-near-zero response. The tilt parameter can also control the amount of loss in the medium, ranging from lossless to dissipative when transitioning from type-I to type-II. Similarly, by tuning either the frequency of the electromagnetic field or the chemical potential in the system, an ϵ-near-zero response can appear as the permittivity of the Weyl semimetal transitions between positive and negative values. Employing the obtained permittivity tensor, we consider a setup where the Weyl semimetal is deposited on a perfect conductive substrate and study the refection and absorption characteristics of this nano-layered configuration. We show that by choosing the proper geometrical and material parameters, devices can be created that perfectly absorb electromagnetic energy over a wide angular range of incident electromagnetic waves.

DOI

10.1103/PhysRevB.98.085109

Citation

Halterman, K, Alidoust, M & Zyuzin, A 2018, 'Epsilon-near-zero response and tunable perfect absorption in Weyl semimetals', Physical Review B, vol. 98, no. 8, 085109, pp. 1-12. https://doi.org/10.1103/PhysRevB.98.085109

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https://urn.fi/URN:NBN:fi:aalto-201809044951

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[article-cris] Perustieteiden korkeakoulu / SCI

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Epsilon-near-zero response and tunable perfect absorption in Weyl semimetals

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