{"596960":{"#nid":"596960","#data":{"type":"event","title":"Robust Quantum Interference in Ultraclean Carbon Nanotubes and Other Stories","body":[{"value":"\u003Ch3\u003E\u003Cstrong\u003ESchool pf Physics,\u0026nbsp;Hard Condensed Matter Seminar:\u0026nbsp; Prof.\u0026nbsp;Vikram V. Deshpande, University of Utah\u003C\/strong\u003E\u003C\/h3\u003E\r\n\r\n\u003Cp\u003EI will talk about ongoing efforts in my lab at the University of Utah in one, two and three dimensional mesoscopic material systems.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EIn 1D, we study longer ultraclean carbon nanotubes than studied previously and observe new conductance oscillations versus gate voltage on top of the commonly observed Fabry-Perot conductance oscillations. These new oscillations are slower than the Fabry-Perot oscillations and up to an order of magnitude more robust in temperature, surviving up to 100K in our devices.\u0026nbsp;Further using structurally characterized nanotubes, we find that the new oscillations are a fingerprint of the structure and allow identification of carbon nanotube chirality from a transport measurement for the first time.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EIn 2D, we study thermal transport in two-dimensional metal-organic graphene analogues and find promising thermoelectric figures of merit for potential application as thermoelectrics.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EIn 3D topological insulators (TIs), we create van der Waals heterostructures with boron nitride and top\/bottom graphite gates for top\/bottom surfaces of 3D TIs.\u0026nbsp;Using these structures, we observe individually tunable half-integer quantum Hall effects in TI surfaces at lower magnetic fields than previous groups.\u003C\/p\u003E\r\n\r\n\u003Cp\u003EI will discuss implications of these measurements and other measurements we are performing on these systems in my lab.\u003C\/p\u003E\r\n","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"Robust Quantum Interference in Ultraclean Carbon Nanotubes and Other Stories"}],"uid":"30957","created_gmt":"2017-10-04 19:57:02","changed_gmt":"2017-10-04 20:35:28","author":"Shaun Ashley","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2017-10-12T16:00:00-04:00","event_time_end":"2017-10-12T16:00:00-04:00","event_time_end_last":"2017-10-12T16:00:00-04:00","gmt_time_start":"2017-10-12 20:00:00","gmt_time_end":"2017-10-12 20:00:00","gmt_time_end_last":"2017-10-12 20:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[],"categories":[],"keywords":[{"id":"960","name":"physics"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78761","name":"Faculty\/Staff"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003Eshaun.ashley@physics.gatech.edu\u003C\/p\u003E\r\n","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}