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 on-site 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.
CITATION STYLE
Henry, R. A., Quach, J. Q., Su, C. H., Greentree, A. D., & Martin, A. M. (2014). Negative refraction of excitations in the Bose-Hubbard model. Physical Review A - Atomic, Molecular, and Optical Physics, 90(4). https://doi.org/10.1103/PhysRevA.90.043639
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