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Topological lasers and condensates

Henning Schomerus, Lancaster University, UK

22.05.2017 at 14:00 

Topological photonics aims to replicate fermionic symmetries as feats of precision engineering. Here I show how to  enhance these systems via effects such as gain, loss and nonlinearities that do not have a direct electronic counterpart. This leads to a topological mechanism of mode selection [1,2], formation of compactons in flat band condensates [3,4], and topological excitations in lasers when linearized around their working point. The resulting effects show a remarkable practical robustness against disorder, which arises from the increased spectral isolation of the manipulated states.

[1] Topologically protected midgap states in complex photonic lattices, H. Schomerus, Opt. Lett. 38, 1912 (2013) [arXiv:1301.0777].
[2] Selective enhancement of topologically induced interface states in a dielectric resonator chain, C. Poli, M. Bellec, U.Kuhl, F. Mortessagne, H. Schomerus, Nat. Commun. 6, 6710 (2015) [arXiv:1407.3703].
[3] Partial chiral symmetry-breaking as a route to spectrally isolated topological defect states in two- dimensional artificial materials, C. Poli, H. Schomerus, M. Bellec, U. Kuhl, and F. Mortessagne, 2D Materials 4, 025008 (2017) [arXiv:1512.02284].
[4] Exciton-polaritons in a two-dimensional Lieb lattice with spin-orbit coupling, C. E. Whittaker et al [arXiv:1705.03006]

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