Topological lasers and condensates
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.
 Topologically protected midgap states in complex photonic lattices, H. Schomerus, Opt. Lett. 38, 1912 (2013) [arXiv:1301.0777].
 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].
 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].
 Exciton-polaritons in a two-dimensional Lieb lattice with spin-orbit coupling, C. E. Whittaker et al [arXiv:1705.03006]
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