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SUMMARY:Photonic topological anomalies - Prof. Henning Schomerus\, Lancast
 er University
DTSTART:20191010T131500Z
DTEND:20191010T141500Z
UID:TALK129271@talks.cam.ac.uk
CONTACT:Katarzyna Macieszczak
DESCRIPTION:Topological photonics aims to replicate fermionic symmetries a
 s 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 dir
 ect electronic counterpart. This leads to a topological mechanism of mode 
 selection [1\,2\,3]\, formation of compactons in at band condensates [4]\,
  and topological excitations in lasers when linearized around their workin
 g point [5]. The resulting effects show a remarkable practical robustness 
 against disorder\, which arises from the increased spectral isolation of t
 he manipulated states. Common to them all are structured intensity distrib
 utions of the topological modes which correspond to an anomaly.\n\n[1] Top
 ologically protected midgap states in complex photonic lattices\, H. Schom
 erus\, Opt. Lett. 38\, 1912 (2013).\n\n[2] Selective enhancement of topolo
 gically induced interface states in a dielectric resonator chain\, C. Poli
 \, M. Bellec\, U.Kuhl\, F. Mortessagne\, H. Schomerus\, Nat. Commun. 6\, 6
 710 (2015).\n\n[3] Topological Hybrid Silicon Microlasers\, H. Zhao et al.
 \, Nat. Commun. 9\, 981 (2018).\n\n[4] Exciton-polaritons in a two-dimensi
 onal Lieb lattice with spin-orbit coupling\, C. E. Whittaker et al.\, Phys
 . Rev. Lett. 120\, 097401 (2018).\n\n[5] Topological dynamics and excitati
 ons in lasers and condensates with saturable gain or loss\, S. Malzard\, E
 . Cancellieri\, and H. Schomerus\, Opt. Express 26\, 22506-22518 (2018).
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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