{"id":11590,"date":"2020-11-09T15:04:45","date_gmt":"2020-11-09T14:04:45","guid":{"rendered":"http:\/\/physics.uwb.edu.pl\/wf\/?page_id=11590"},"modified":"2020-11-09T15:04:45","modified_gmt":"2020-11-09T14:04:45","slug":"o-marianie-smoluchowskim-w-setna-rocznice-smierci-2-2-2-2-2-4-3-2-2-2-2-2-2-2-3-3-2-3-2-2-2-2-3-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-3-3-2-2-2-3-3-2-2-2-2-2-3-2-3-2-2-2-2-2-2-2-3-3-3","status":"publish","type":"page","link":"https:\/\/physics.uwb.edu.pl\/wf\/?page_id=11590","title":{"rendered":"Berezinskii-Kosterlitz-Thouless phase"},"content":{"rendered":"<h3><strong>Konwersatorium wydzia\u0142owe (<a href=\"https:\/\/physics.uwb.edu.pl\/wf\/?page_id=11591\">online<\/a>)<br \/>\n<\/strong><\/h3>\n<p align=\"justify\">Dnia 2020-11-10 o godzinie 13:15 odb\u0119dzie si\u0119 wyk\u0142ad (<a href=\"https:\/\/physics.uwb.edu.pl\/wf\/?page_id=11510\">konwersatorium odb\u0119dzie si\u0119 \u201eonline\u201d z wykorzystaniem platformy ZOOM<\/a>), na kt\u00f3rym<strong> dr Krzysztof Gawryluk z Katedry Astrofizyki i Fizyki Teoretycznej <\/strong>wyg\u0142osi wyk\u0142ad pt:<\/p>\n<h3 style=\"text-align: center;\"><span style=\"font-size: 36px;\"><strong>&#8220;Berezinskii-Kosterlitz-Thouless phase<span style=\"font-size: 36px;\">&#8220;<\/span><\/strong><\/span><\/h3>\n<p style=\"text-align: right;\">Serdecznie zapraszamy<\/p>\n<p style=\"text-align: right;\">Andrzej Maziewski<\/p>\n<p style=\"text-align: right;\">Jerzy Przeszowski<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"font-size: 20px;\">Berezinskii-Kosterlitz-Thouless phase<\/span><\/strong><\/p>\n<p class=\"western\">Intrigued by a recent experiment<a href=\"https:\/\/journals.aps.org\/prl\/abstract\/10.1103\/PhysRevLett.121.145301\" target=\"_blank\" rel=\"noopener noreferrer\"> [J.L. Ville et al., Phys. Rev. Lett.121, 145301 (2018)]<\/a>, we study the sound propagation in a two-dimensional weakly interacting uniform Bose gas. Using the classical fieldsapproximation we first successfully reproduce original experimental results and next, we analyze in detail the nature of generated density waves. Playing with a spatial resolution of our (numerical) imaging system, we identify observed structures as quasisolitons and uncover their internal complexity. Quasisolitons break into vortex pairs as time progresses, eventually reaching an equilibrium state. We find this state, characterized by only fluctuating in time averaged number of pairs of opposite charge vortices and by appearance of quasi-long-range&nbsp; order, as the Berezinskii-Kosterlitz-Thouless (BKT) phase.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Konwersatorium wydzia\u0142owe (online) Dnia 2020-11-10 o godzinie 13:15 odb\u0119dzie si\u0119 wyk\u0142ad (konwersatorium odb\u0119dzie si\u0119 \u201eonline\u201d z wykorzystaniem platformy ZOOM), na kt\u00f3rym dr Krzysztof Gawryluk z Katedry Astrofizyki i Fizyki Teoretycznej <a href=\"https:\/\/physics.uwb.edu.pl\/wf\/?page_id=11590\" class=\"more-link\">[&hellip;]<\/a><\/p>\n","protected":false},"author":14,"featured_media":8413,"parent":822,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"Layout":"1c","footnotes":""},"categories":[69],"tags":[],"class_list":["entry","author-ulag","post-11590","page","type-page","status-publish","has-post-thumbnail","category-seminarium_pl"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P7nvcn-30W","_links":{"self":[{"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=\/wp\/v2\/pages\/11590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11590"}],"version-history":[{"count":1,"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=\/wp\/v2\/pages\/11590\/revisions"}],"predecessor-version":[{"id":11593,"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=\/wp\/v2\/pages\/11590\/revisions\/11593"}],"up":[{"embeddable":true,"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=\/wp\/v2\/pages\/822"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=\/wp\/v2\/media\/8413"}],"wp:attachment":[{"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/physics.uwb.edu.pl\/wf\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}