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

Klaus Halterman, Mohammad Alidoust, Alexander Zyuzin

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)
190 Downloads (Pure)

Abstract

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.

Original languageEnglish
Article number085109
Pages (from-to)1-12
JournalPhysical Review B
Volume98
Issue number8
DOIs
Publication statusPublished - 6 Aug 2018
MoE publication typeA1 Journal article-refereed

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