Negative Refraction of Excitations in the Bose-Hubbard Model
arXiv:1407.4882 · doi:10.1103/PhysRevA.90.043639
Abstract
Ultracold atoms in optical lattices provide a unique opportunity to study Bose- Hubbard physics. In this work we show that by considering a spatially varying onsite interaction it is possible to manipulate the motion of excitations above the Mott phase in a Bose-Hubbard system. Specifically, we show that it is possible to "engineer" regimes where excitations will negatively refract, facilitating the construction of a flat lens.
arXiv comment6 pages, 4 figures
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