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Composite multi-vortex diffraction-free beams and van Hove singularities in honeycomb lattices

Authors :
Paltoglou, Vassilis
Chen, Zhigang
Efremidis, Nikolaos K.
Publication Year :
2015

Abstract

We find diffraction-free beams for graphene and MoS$_2$-type honeycomb optical lattices. The resulting composite solutions have the form of multi-vortices, with spinor topological charges ($n$, $n\pm1$). Exact solutions for the spinor components are obtained in the Dirac limit. The effects of the valley degree of freedom and the mass are analyzed. Passing through the van-Hove singularity the topological structure of the solutions is modified. Exactly at the singularity the diffraction-free beams take the form of strongly localized one-dimensional stripes.<br />Comment: 4 pages, 6 figures, accepted for publication in Optics Letters

Subjects

Subjects :
Physics - Optics

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1502.01879
Document Type :
Working Paper
Full Text :
https://doi.org/10.1364/OL.40.001037