{"586673":{"#nid":"586673","#data":{"type":"event","title":"Bose-Einstein condensation of magnons at room temperature: creation, spatio-temporal properties and possible superfluidity","body":[{"value":"\u003Ch4\u003E\u003Cstrong\u003ESchool of Physics Hard Condensed Matter Seminar: Prof. Sergej Demokritov, University of M\u0026uuml;nster\u003C\/strong\u003E\u003C\/h4\u003E\r\n\r\n\u003Cp\u003EMagnons are the quanta of waves of spin precession in magnetically ordered media. In thermal equilibrium, they can be considered as a gas of quasiparticles obeying the Bose-Einstein statistics with zero chemical potential and a temperature dependent density.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EWe will discuss the room-temperature kinetics and thermodynamics of the magnons gas in yttrium iron garnet films driven by a microwave pumping and investigated by means of the Brillouin light scattering spectroscopy.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EWe show that the thermalization of the driven magnon gas results in a quasi-equilibrium state described the Bose-Einstein statistics with a non-zero chemical potential, the latter being dependent on the pumping power. For high enough pumping powers Bose-Einstein condensation (BEC) of magnons can be experimentally achieved at room temperature. Spatio-temporal kinetics of the BEC-condensate will be discussed in detail.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EAmong others interference of two condensates, persistent quantized vortices, and propagating waves of the condensate density will be addressed. Finally, our recent experiments on moving condensates will be discussed.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Bose-Einstein condensation of magnons at room temperature: creation, spatio-temporal properties and possible superfluidity"}],"uid":"27664","created_gmt":"2017-01-31 13:58:08","changed_gmt":"2017-04-13 21:13:04","author":"Alison Morain","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2017-03-08T15:00:00-05:00","event_time_end":"2017-03-08T16:00:00-05:00","event_time_end_last":"2017-03-08T16:00:00-05:00","gmt_time_start":"2017-03-08 20:00:00","gmt_time_end":"2017-03-08 21:00:00","gmt_time_end_last":"2017-03-08 21:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"hg_media":{"586674":{"id":"586674","type":"image","title":"Sergej Demokritov","body":null,"created":"1485872637","gmt_created":"2017-01-31 14:23:57","changed":"1485872637","gmt_changed":"2017-01-31 14:23:57","alt":"","file":{"fid":"223573","name":"s. Demokritov.jpg","image_path":"\/sites\/default\/files\/images\/s.%20Demokritov.jpg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/images\/s.%20Demokritov.jpg","mime":"image\/jpeg","size":4078,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/images\/s.%20Demokritov.jpg?itok=QCh-1twV"}}},"media_ids":["586674"],"groups":[{"id":"1278","name":"College of Sciences"},{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[{"id":"960","name":"physics"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"78751","name":"Undergraduate students"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003Eamorain@gatech.edu\u003C\/p\u003E\r\n","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}