{"id":426786,"date":"2018-11-06T16:57:15","date_gmt":"2018-11-07T00:57:15","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/?post_type=msr-research-item&p=426786"},"modified":"2018-11-06T16:57:15","modified_gmt":"2018-11-07T00:57:15","slug":"topological-polaritons","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/topological-polaritons\/","title":{"rendered":"Topological Polaritons"},"content":{"rendered":"

The interaction between light and matter can give rise to novel topological states. This principle was recently exemplified in Floquet topological insulators, where classical<\/em>\u00a0light was used to induce a topological electronic band structure. Here, in contrast, we show that mixing single<\/em>\u00a0photons with excitons can result in new topological polaritonic states — or “topolaritons”. Taken separately, the underlying photons and excitons are topologically trivial. Combined appropriately, however, they give rise to non-trivial polaritonic bands with chiral edge modes allowing for unidirectional polariton propagation. The main ingredient in our construction is an exciton-photon coupling with a phase that winds in momentum space. We demonstrate how this winding emerges from spin-orbit coupling in the electronic system and an applied Zeeman field. We discuss the requirements for obtaining a sizable topological gap in the polariton spectrum, and propose practical ways to realize topolaritons in semiconductor quantum wells and monolayer transition metal dichalcogenides.<\/p>\n","protected":false},"excerpt":{"rendered":"

The interaction between light and matter can give rise to novel topological states. This principle was recently exemplified in Floquet topological insulators, where classical\u00a0light was used to induce a topological electronic band structure. Here, in contrast, we show that mixing single\u00a0photons with excitons can result in new topological polaritonic states — or “topolaritons”. Taken separately, […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":[{"type":"user_nicename","value":"tokarzig"}],"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"Physical Review 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