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Topological properties of a dense atomic lattice gas


Robert J. Bettles

Charles S. Adams


We investigate the existence of topological phases in a dense two-dimensional atomic lattice gas. The coupling of the atoms to the radiation field gives rise to dissipation and a non-trivial coherent long-range exchange interaction whose form goes beyond a simple power-law. The far-field terms of the potential -- which are particularly relevant for atomic separations comparable to the atomic transition wavelength -- can give rise to energy spectra with one-sided divergences in the Brillouin zone. The long-ranged character of the interactions has another important consequence: it can break the standard bulk-boundary relation in topological insulators. We show that topological properties such as the transport of an excitation along the edge of the lattice are robust with respect to the presence of lattice defects and dissipation. The latter is of particular relevance as dissipation and coherent interactions are inevitably connected in our setting.


Bettles, R. J., Minář, J., Adams, C. S., Lesanovsky, I., & Olmos, B. (2017). Topological properties of a dense atomic lattice gas. Physical Review A, 96(4), Article 041603.

Journal Article Type Article
Acceptance Date Sep 27, 2017
Publication Date Oct 10, 2017
Deposit Date Oct 3, 2017
Publicly Available Date Oct 10, 2017
Journal Physical Review A
Print ISSN 2469-9926
Electronic ISSN 2469-9934
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 96
Issue 4
Article Number 041603
Public URL
Publisher URL
Additional Information ©2017 American Physical Society


PhysRevA.96.041603.pdf (1.1 Mb)

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