{"468551":{"#nid":"468551","#data":{"type":"event","title":"High field magneto-optical spectroscopy of Dirac materials","body":[{"value":"\u003Ch6\u003ESchool of Physics Hard Condensed Matter \u0026amp; AMO Seminar: Jonathan Ludwig, Florida State University\u003C\/h6\u003E\u003Cp\u003EDirac materials can be broadly defined as systems with the electronic structure that can be described by a Dirac equation for massless or massive fermions. Graphene is arguably the most well known Dirac material where the low-energy states behave as relativistic massless particles. Other examples of \u201cgraphene-inspired\u201d 2D Dirac materials include HgTe quantum wells near the transition between trivial semiconductor and quantum spin Hall states and monolayers of semiconducting transition metal dichalcogenides (TMDs). In this talk, I will discuss our recent optical magneto spectroscopy studies of these novel 2D electronic materials. The use of complementary optical techniques (infrared, photoluminescence, Raman scattering, photo-conductivity spectroscopy) combined with high magnetic fields offers exceptionally sensitive and selective experimental probes to explore and control their electronic structure through Zeeman and orbital quantization effects. Specifically, I will discuss cyclotron resonance of single-valley Dirac fermions in nearly gapless HgTe quantum wells [1], valley-selective Zeeman effect in monolayer TMDs [2], and photoconductivity probe of the Hofstadter spectrum in BN encapsulated graphene.\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003E \u0022Helvetica Neue\u0022\u0022\u0026gt;\u0026nbsp;\u003C\/strong\u003E mso-bidi-font-size:12.0pt;font-family:\u0022Helvetica Neue\u0022\u0022\u0026gt;[1] J. Ludwig, Y.B. Vasilyev, N.N. Mikhailov, J.M. Poumirol, Z. Jiang, O. Vafek, and D. Smirnov. Cyclotron resonance of single-valley Dirac fermions in nearly gapless HgTe quantum wells. Phys. Rev. B 89, 241406(R) (2014).\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":[{"value":"High field magneto-optical spectroscopy of Dirac materials"}],"uid":"27664","created_gmt":"2015-11-11 09:48:50","changed_gmt":"2017-04-13 21:17:40","author":"Alison Morain","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2015-11-18T18:00:00-05:00","event_time_end":"2015-11-18T19:00:00-05:00","event_time_end_last":"2015-11-18T19:00:00-05:00","gmt_time_start":"2015-11-18 23:00:00","gmt_time_end":"2015-11-19 00:00:00","gmt_time_end_last":"2015-11-19 00:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"126011","name":"School of Physics"}],"categories":[],"keywords":[{"id":"147561","name":"magneto-optical"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1795","name":"Seminar\/Lecture\/Colloquium"}],"invited_audience":[{"id":"78751","name":"Undergraduate students"},{"id":"78761","name":"Faculty\/Staff"},{"id":"174045","name":"Graduate students"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003E\u003Ca href=\u0022mailto:amorain@gatech.edu\u0022\u003Eamorain@gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}