000087624 001__ 87624 000087624 005__ 20200922122726.0 000087624 0247_ $$2doi$$a10.1103/PhysRevLett.123.217401 000087624 0248_ $$2sideral$$a115853 000087624 037__ $$aART-2019-115853 000087624 041__ $$aeng 000087624 100__ $$0(orcid)0000-0002-0058-9746$$aDowning, C.A. 000087624 245__ $$aTopological Phases of Polaritons in a Cavity Waveguide 000087624 260__ $$c2019 000087624 5060_ $$aAccess copy available to the general public$$fUnrestricted 000087624 5203_ $$aWe study the unconventional topological phases of polaritons inside a cavity waveguide, demonstrating how strong light-matter coupling leads to a breakdown of the bulk-edge correspondence. We observe an ostensibly topologically nontrivial phase, which unexpectedly does not exhibit edge states. Our findings are in direct contrast to topological tight-binding models with electrons, such as the celebrated Su-Schrieffer-Heeger (SSH) model. We present a theory of collective polaritonic excitations in a dimerized chain of oscillating dipoles embedded inside a photonic cavity. The added degree of freedom from the cavity photons upgrades the system from a typical SSH SU(2) model into a largely unexplored SU(3) model. Tuning the light-matter coupling strength by changing the cavity size reveals three critical points in parameter space: When the polariton band gap closes, when the Zak phase changes from being trivial to nontrivial, and when the edge state is lost. These three critical points do not coincide, and thus the Zak phase is no longer an indicator of the presence of edge states. Our discoveries demonstrate some remarkable properties of topological matter when strongly coupled to light, and could be important for the growing field of topological nanophotonics. 000087624 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/MAT2017-88358-C3-1-R 000087624 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000087624 590__ $$a8.385$$b2019 000087624 591__ $$aPHYSICS, MULTIDISCIPLINARY$$b6 / 85 = 0.071$$c2019$$dQ1$$eT1 000087624 592__ $$a3.588$$b2019 000087624 593__ $$aPhysics and Astronomy (miscellaneous)$$c2019$$dQ1 000087624 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000087624 700__ $$aSturges, T.J. 000087624 700__ $$aWeick, G. 000087624 700__ $$aStobinska, M. 000087624 700__ $$0(orcid)0000-0001-9273-8165$$aMartín-Moreno, L.$$uUniversidad de Zaragoza 000087624 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada 000087624 773__ $$g123, 21 (2019), 217401 [7 pp.]$$pPhys. rev. lett.$$tPhysical Review Letters$$x0031-9007 000087624 8564_ $$s917755$$uhttps://zaguan.unizar.es/record/87624/files/texto_completo.pdf$$yVersión publicada 000087624 8564_ $$s122353$$uhttps://zaguan.unizar.es/record/87624/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000087624 909CO $$ooai:zaguan.unizar.es:87624$$particulos$$pdriver 000087624 951__ $$a2020-09-22-12:21:19 000087624 980__ $$aARTICLE