{"id":36434,"date":"2018-03-06T20:29:40","date_gmt":"2018-03-06T19:29:40","guid":{"rendered":"http:\/\/www.erbium.at\/FF\/?p=36434"},"modified":"2020-10-14T15:38:02","modified_gmt":"2020-10-14T13:38:02","slug":"observation-of-the-tirolian-roton-quasiparticle","status":"publish","type":"post","link":"https:\/\/www.erbium.at\/FF\/observation-of-the-tirolian-roton-quasiparticle\/","title":{"rendered":"Observation of roton quasiparticles in Erbium"},"content":{"rendered":"<p><strong><a href=\"https:\/\/www.nature.com\/articles\/s41567-018-0054-7\" target=\"_blank\" rel=\"noopener noreferrer\"> Now in Nature Physics!<\/a> <a href=\"http:\/\/www.erbium.at\/FF\/wp-content\/uploads\/2018\/03\/TiRoton.png\" target=\"_blank\" rel=\"noopener noreferrer\"> <img loading=\"lazy\" class=\" wp-image-36435 alignleft\" src=\"http:\/\/www.erbium.at\/FF\/wp-content\/uploads\/2018\/03\/TiRoton.png\" alt=\"\" width=\"566\" height=\"573\" srcset=\"https:\/\/www.erbium.at\/FF\/wp-content\/uploads\/2018\/03\/TiRoton.png 604w, https:\/\/www.erbium.at\/FF\/wp-content\/uploads\/2018\/03\/TiRoton-297x300.png 297w\" sizes=\"(max-width: 566px) 100vw, 566px\" \/><\/a><\/strong><\/p>\n<p>In collaboration with our theory collaborators from Innsbruck (Rick van Bijnen) and Hannover (Falk W\u00e4chtler and Luis Santos), we have observed for the first time so-called roton quasiparticles in an ultracold quantum gas of highly magnetic bosonic erbium.<\/p>\n<p><!--more--><\/p>\n<p>Empirically introduced by Landau to explain the bizarre properties of superfluid liquid Helium, the roton quasiparticles reflect an \u201cenergy softening\u201d in the system as precursor of a crystalization instability. Our work demonstrates similar phenomena in the quantum-gas phase thanks to magnetic interactions, paving the way for a novel understanding of paradigmatic states of quantum fluids, such as supersolids.<\/p>\n<p>Press release: <a href=\"https:\/\/www.uibk.ac.at\/newsroom\/roton-quasiparticles-observed-in-quantum-gas.html.en\">https:\/\/www.uibk.ac.at\/newsroom\/roton-quasiparticles-observed-in-quantum-gas.html.en<\/a><\/p>\n<p>Article: <a href=\"https:\/\/www.nature.com\/articles\/s41567-018-0054-7\">https:\/\/www.nature.com\/articles\/s41567-018-0054-7<\/a><\/p>\n<p>Caption\u00a0: The energy landscape on a Bose-Einstein condensate is not a flat plain: starting from the ground level of zero momentum, the elementary excitations, increasing in momentum, follow like a mountain ridge, the height difference that they climb giving the excitation energy. The mountain ridge of a cigar-shaped condensate of magnetic atoms (background cloud) can support a saddle. The saddle, a minimum in the energy landscape, arises from the long-range and anisotropic dipolar interatomic interactions (jets) and corresponds to a privileged modulation in the spatial organization of the atoms (spheres) at a given wavelength, the roton (foreground cloud).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Now in Nature Physics!<\/p>\n<p>In collaboration with our theory collaborators from Innsbruck (Rick van Bijnen) and Hannover (Falk W\u00e4chtler and Luis Santos), we have observed for the first time so-called roton quasiparticles in an ultracold quantum gas of highly magnetic bosonic erbium.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[38,3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/posts\/36434"}],"collection":[{"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/comments?post=36434"}],"version-history":[{"count":6,"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/posts\/36434\/revisions"}],"predecessor-version":[{"id":38582,"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/posts\/36434\/revisions\/38582"}],"wp:attachment":[{"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/media?parent=36434"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/categories?post=36434"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.erbium.at\/FF\/wp-json\/wp\/v2\/tags?post=36434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}