Layered van der Waals crystals with hyperbolic light dispersion

M. N. Gjerding, R. Petersen, T. G. Pedersen, N. A. Mortensen and K. S. Thygesen ()
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M. N. Gjerding: Technical University of Denmark
R. Petersen: Aalborg University
T. G. Pedersen: Aalborg University
N. A. Mortensen: Center for Nanostructured Graphene (CNG), Technical University of Denmark
K. S. Thygesen: Technical University of Denmark

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Compared to artificially structured hyperbolic metamaterials, whose performance is limited by the finite size of the metallic components, the sparse number of naturally hyperbolic materials recently discovered are promising candidates for the next generation of hyperbolic materials. Using first-principles calculations, we extend the number of known naturally hyperbolic materials to the broad class of layered transition metal dichalcogenides (TMDs). The diverse electronic properties of the transition metal dichalcogenides result in a large variation of the hyperbolic frequency regimes ranging from the near-infrared to the ultraviolet. Combined with the emerging field of van der Waals heterostructuring, we demonstrate how the hyperbolic properties can be further controlled by stacking different two-dimensional crystals opening new perspectives for atomic-scale design of photonic metamaterials. As an application, we identify candidates for Purcell factor control of emission from diamond nitrogen-vacancy centers.

Date: 2017
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DOI: 10.1038/s41467-017-00412-y

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