Signatures of complex optical response in Casimir interactions of type I and II Weyl semimetals
| Autor: | Adrian Popescu, Nail R. Khusnutdinov, Pablo Rodriguez-Lopez, Lilia M. Woods, Ignat Fialkovsky |
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| Rok vydání: | 2020 |
| Předmět: |
FOS: Physical sciences
Thermal fluctuations 02 engineering and technology 01 natural sciences Optical conductivity Surface conductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences General Materials Science Boundary value problem 010306 general physics Anisotropy Materials of engineering and construction. Mechanics of materials Physics Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Semimetal Casimir effect Mechanics of Materials TA401-492 Condensed Matter::Strongly Correlated Electrons 0210 nano-technology Fermi Gamma-ray Space Telescope |
| Zdroj: | Communications Materials, Vol 1, Iss 1, Pp 1-9 (2020) |
| ISSN: | 2662-4443 |
| DOI: | 10.1038/s43246-020-0015-4 |
| Popis: | The Casimir interaction is induced by electromagnetic fluctuations between objects and it is strongly dependent upon the electronic and optical properties of the materials making up the objects. Here we investigate this ubiquitous interaction between Weyl semimetals, a class of 3D systems with low energy linear dispersion and nontrivial topology due to symmetry conditions and stemming from separated energy cones. A comprehensive examination of all components of the bulk conductivity tensor as well as the surface conductivity due to the Fermi arc states in real and imaginary frequency domains is presented using the Kubo formalism for Weyl semimetals with different degree of tilting of their linear energy cones. The Casimir energy is calculated using a generalized Lifhsitz approach, for which electromagnetic boundary conditions for anisotropic materials were derived and used. We find that the Casimir interaction between Weyl semimetals is metallic-like and its magnitude and characteristic distance dependence can be modified by the degree of tilting and chemical potential. The nontrivial topology plays a secondary role in the Casimir interaction of these 3D materials and thermal fluctuations are expected to have similar effects as in metallic systems. Comment: supplementary information added |
| Databáze: | OpenAIRE |
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