{"152101":{"#nid":"152101","#data":{"type":"event","title":"MRSEC Seminar Series with Prof. Dan Dougherty","body":[{"value":"\u003Cp\u003EThe first MRSEC Seminar of the Fall 2012 Series welcomes Dr. Dan Dougherty, a faculty member of the School of Physics at North Carolina State University in Raleigh,NC, on September 18, 2012 at 3:00pm in the Marcus Nanotechnology Building conference rooms located on the first floor.\u0026nbsp; His talk is title: \u003Cem\u003EDoping Effects Due to the Intercalation of Epitaxial Graphene on SiC: Local Spectroscopy of Image-Potential States\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003E\u003Cem\u003EAbstract:\u003C\/em\u003E\u003C\/p\u003E\u003Cp\u003EAn exciting route to controlling the electronic properties of graphene on SiC(0001) is to \u201cintercalate\u201d new atomic species beneath the 6\u221a3 buffer layer, decoupling it from the substrate to form a new graphene sheet with properties partially-determined by the intercalant atoms.\u0026nbsp; This approach is an attempted adaptation of the fascinating property variation that can be found in graphite intercalation compounds [1]. So far, intercalation of graphene on SiC(0001) has been carried out for numerous systems, including Ca to enhance electron doping effects [2] and H to create quasi-neutral graphene [3].\u003C\/p\u003E\u003Cp\u003E\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp;\u0026nbsp; Since intercalation processes in these systems only involve the top-most surface layers, they are likely to be more kinetically efficient than bulk intercalation processes in graphite.\u0026nbsp; I\u2019ll illustrate this in the case of Na, which is not known to intercalate graphite [1], but which readily intercalates single layer graphene on SiC \u003Cem\u003Eat room temperature \u003C\/em\u003E[4].\u0026nbsp; Scanning Tunneling Microscopy shows several different Na-intercalation structures that can coexist for epitaxial graphene.\u0026nbsp; Local tunneling spectroscopy of image-potential-derived surface state allows a probe of electron doping effects in this system and also comparison with electronic structure calculations.\u0026nbsp; Finally, I\u0027ll describe similar STM\/STS experiments for hydrogen intercalation in this system and discuss implications for the origin of interlayer states in graphite [5].\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EThe first MRSEC Seminar of the Fall 2012 Series welcomes Dr. Dan Dougherty, a faculty member of the School of Physics at North Carolina State University in Raleigh,NC, on September 18, 2012 at 3:00pm in the Marcus Nanotechnology Building conference rooms located on the first floor.\u0026nbsp; His talk is title: \u003Cem\u003EDoping Effects Due to the Intercalation of Epitaxial Graphene on SiC: Local Spectroscopy of Image-Potential States\u003C\/em\u003E\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"The focus of the seminar is: \u0022Doping Effects Due to Intercalation of Epitaxial Graphene on SiC: Local Spectroscopy of Image-Potential States\u0022"}],"uid":"27428","created_gmt":"2012-09-06 10:59:36","changed_gmt":"2016-10-08 01:59:49","author":"Gina Adams","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2012-09-18T16:00:00-04:00","event_time_end":"2012-09-18T17:00:00-04:00","event_time_end_last":"2012-09-18T17:00:00-04:00","gmt_time_start":"2012-09-18 20:00:00","gmt_time_end":"2012-09-18 21:00:00","gmt_time_end_last":"2012-09-18 21:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"related_links":[{"url":"http:\/\/www.physics.ncsu.edu\/people\/faculty_dougherty.html","title":"Dr. Dougherty"},{"url":"http:\/\/www.mrsec.gatech.edu\/","title":"Materials Research Science and Engineering Center"}],"groups":[{"id":"60783","name":"MRSEC"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EGina Adams\u003C\/p\u003E\u003Cp\u003EGT MRSEC Seminar Series\u003C\/p\u003E\u003Cp\u003E\u003Ca href=\u0022mailto:gina.adams@mrsec.gatech.edu\u0022\u003Egina.adams@mrsec.gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}