{"388111":{"#nid":"388111","#data":{"type":"event","title":"Hofstadter\u2019s Butterfly in the strongly interacting regime","body":[{"value":"\u003Ch5\u003ESchool of Physics Colloquium: Prof. Cory Dean, Columbia University\u003C\/h5\u003E\u003Cp\u003EIn 1976, Douglas Hofstadter predicted that in the presence of both a strong magnetic field, and a spatially varying periodic potential, Bloch electrons confined to a 2D quantum well exhibit a self-similar fractal energy spectrum known as the \u0022Hofstadter\u0027s Butterfly\u0022.\u0026nbsp; In subsequent years, experimental discovery of the quantum Hall effect gave birth to an expansive field of research into 2D electronic systems in the presence of a magnetic field, however, direct confirmation of the fractal spectrum remained elusive. Recently we demonstrated that graphene, in which Bloch electrons can be described by Dirac fermions, provides a new \u0026nbsp;opportunity to investigate this nearly 40 year old problem. In this talk I will discuss the \u0026nbsp;experimental realization of Hofstader\u0027s butterfly by exploiting nano-scale interfacial effects between graphene and hexagonal boron nitride substrates, together with application of extremely high magnetic fields.\u0026nbsp; Utilizing newly developed techniques to fabricate ultra-clean graphene devices, I will additionally discus the capability to probe for the first time the effect of strong electron interactions , within the fractal Hofstadter spectrum.\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Hofstadter\u2019s Butterfly in the strongly interacting regime"}],"uid":"27664","created_gmt":"2015-03-17 10:21:11","changed_gmt":"2016-10-08 01:46:36","author":"Alison Morain","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2015-03-23T15:00:00-04:00","event_time_end":"2015-03-23T16:00:00-04:00","event_time_end_last":"2015-03-23T16:00:00-04:00","gmt_time_start":"2015-03-23 19:00:00","gmt_time_end":"2015-03-23 20:00:00","gmt_time_end_last":"2015-03-23 20:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003E\u003Ca href=\u0022mailto:alison.morain@physics.gatech.edu\u0022\u003Ealison.morain@physics.gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}