{"id":113165,"date":"2020-09-18T20:23:00","date_gmt":"2020-09-19T03:23:00","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2020\/09\/the-observation-of-bloch-ferromagnetism-in-composite-fermions"},"modified":"2020-09-18T20:23:00","modified_gmt":"2020-09-19T03:23:00","slug":"the-observation-of-bloch-ferromagnetism-in-composite-fermions","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2020\/09\/the-observation-of-bloch-ferromagnetism-in-composite-fermions","title":{"rendered":"The observation of Bloch ferromagnetism in composite fermions"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/the-observation-of-bloch-ferromagnetism-in-composite-fermions2.jpg\"><\/a><\/p>\n<p>Composite fermions are exotic quasi-particles found in interacting 2-D fermion systems at relatively large perpendicular magnetic fields. These quasi-particles, which are composed of an electron and two magnetic flux quanta, have often been used to describe a physical phenomenon known as the fractional quantum Hall effect.<\/p>\n<p>Researchers at Princeton University and Pennsylvania State University recently used composite <a href=\"https:\/\/phys.org\/tags\/fermions\/\" rel=\"tag\" class=\"\">fermions<\/a> to test a theory introduced by physicist Felix Bloch almost a century ago, suggesting that at very low densities, a paramagnetic Fermi \u201csea\u201d of electrons should spontaneously transition to a fully magnetized state, which is now referred to as Bloch ferromagnetism. Their paper, published in <i>Nature Physics<\/i>, provides evidence of an abrupt transition to full magnetization that is closely aligned with the state theorized by Bloch.<\/p>\n<p>\u201cComposite fermions are truly remarkable,\u201d Mansour Shayegan, professor of Electrical Engineering at Princeton University and one of the researchers who carried out the study, told Phys.org. \u201cThey are born of interaction and magnetic flux, and yet they map such a complex system to a simple collection of quasi-particles that to a large degree behave as non-interacting and also behave as if they don\u2019t feel the large magnetic field. One of their most interesting properties is their spin polarization.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Composite fermions are exotic quasi-particles found in interacting 2-D fermion systems at relatively large perpendicular magnetic fields. These quasi-particles, which are composed of an electron and two magnetic flux quanta, have often been used to describe a physical phenomenon known as the fractional quantum Hall effect. Researchers at Princeton University and Pennsylvania State University recently [\u2026]<\/p>\n","protected":false},"author":513,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[48,1617],"tags":[],"class_list":["post-113165","post","type-post","status-publish","format-standard","hentry","category-particle-physics","category-quantum-physics"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/113165","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/513"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=113165"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/113165\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=113165"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=113165"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=113165"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}