{"id":235470,"date":"2017-03-28T17:19:13","date_gmt":"2017-03-28T20:19:13","guid":{"rendered":"http:\/\/revistapesquisa.fapesp.br\/en\/?p=235470"},"modified":"2017-03-28T17:19:13","modified_gmt":"2017-03-28T20:19:13","slug":"quasiparticle-formation","status":"publish","type":"post","link":"https:\/\/revistapesquisa.fapesp.br\/en\/quasiparticle-formation\/","title":{"rendered":"Quasiparticle formation"},"content":{"rendered":"<p>A team of physicists at the University of Innsbruck, in Austria, simulated the formation of a type of quasiparticle \u2013 a collective excitation in an environment that behaves as if it were a particle \u2013 and observed it in real time (<em>Science<\/em>, October 7, 2016).\u00a0The researchers recorded the birth of Fermi polarons, a type of quasiparticle, in an ultracold quantum gas composed of potassium atoms embedded in a cloud of lithium atoms. In condensed-matter systems, the process takes about 100 attoseconds (1 attosecond is equal to 1\u00d710<sup>\u221218<\/sup>\u00a0of 1 second). In the gas simulation, where the system was less dense, the polarons formed in a few microseconds. Rudolf Grimm, study coordinator, uses a metaphor to explain the concept of a quasiparticle. \u201cYou could picture it as a skier on a powder day,\u201d says Grimm. \u201cThe skier is surrounded by a cloud of snow crystals. Together they form a system that has different properties than the skier without the cloud.\u201d This system is a quasiparticle.<\/p>\n","protected":false},"excerpt":{"rendered":"A team of physicists observed the formation of a type of quasiparticle","protected":false},"author":475,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[168],"tags":[235],"coauthors":[785],"class_list":["post-235470","post","type-post","status-publish","format-standard","hentry","category-technoscience","tag-physics"],"acf":[],"_links":{"self":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/235470","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/users\/475"}],"replies":[{"embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/comments?post=235470"}],"version-history":[{"count":0,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/posts\/235470\/revisions"}],"wp:attachment":[{"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/media?parent=235470"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/categories?post=235470"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/tags?post=235470"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/revistapesquisa.fapesp.br\/en\/wp-json\/wp\/v2\/coauthors?post=235470"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}