Giant anisotropy and Casimir phenomena: the case of carbon nanotube metasurfaces Auteur(s): Rodriguez-Lopez Pablo, Le Dai-Nam, Bondarev Igor V, Antezza M., Woods Lilia M (Article) Publié: Physical Review B, vol. 109 p.035422 (2024) Texte intégral en Openaccess : Ref HAL: hal-04324164_v1 Ref Arxiv: 2311.05001 Ref INSPIRE: 2720608 DOI: 10.1103/PhysRevB.109.035422 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote Résumé: The Casimir interaction and torque are related phenomena originating from the exchange of electromagnetic excitations between objects. While the Casimir force exists between any types of objects, the materials or geometrical anisotropy drives the emergence of the Casimir torque. Here both phenomena are studied theoretically between dielectric films with immersed parallel single wall carbon nanotubes in the dilute limit with their chirality and collective electronic and optical response properties taken into account. It is found that the Casimir interaction is dominated by thermal fluctuations at sub-micron separations, while the torque is primarily determined by quantum mechanical effects. This peculiar quantum vs. thermal separation is attributed to the strong influence of reduced dimensionality and inherent anisotropy of the materials. Our study suggests that nanostructured anisotropic materials can serve as novel platforms to uncover new functionalities in ubiquitous Casimir phenomena. |