BEGIN:VCALENDAR VERSION:2.0 METHOD:PUBLISH PRODID:-//Missouri State University/Calendar of Events//EN CALSCALE:GREGORIAN X-WR-TIMEZONE:America/Chicago BEGIN:VTIMEZONE TZID:America/Chicago BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 DTSTART:20070311T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU TZNAME:CDT END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 DTSTART:20071104T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU TZNAME:CST END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:86b0c354-9b14-4fbb-b9b6-c8c299e08792.220472@calendar.missouristate.edu CREATED:20220321T135028Z LAST-MODIFIED:20220321T135028Z LOCATION: SUMMARY:PAMS Seminar: "Cloning of Dirac Electrons in Graphene/SiC Heteros tructure" by Dr. Guang Bian DESCRIPTION:Dr. Guang BianDepartment of Physics & AstronomyUniversity of M issouri\n\n\nAbstract:\n\n\nTuning interaction between Dirac states in gr aphene has attracted great interest because it modifies the spectra of th e two-dimensional electron system and\, consequently\, gives rise to nove l condensed-matter phases such as superconductors\, Mott insulators\, Wig ner crystals and quantum anomalous Hall insulators. For example\, emergen t superconductivity occurs in twisted bilayer graphene at magic angles du e to the enhanced correlation between Dirac fermions in the two graphene layers. In this work\, we report a new way to engineer the band structure of graphene\, namely\, cloning Dirac states by the perturbation of subst rate potential. We grow the graphene epitaxially on 6H-SiC substrate. The SiC surface potential exerts an incommensurate perturbation to the graph ene Dirac bands\, resulting in the duplication of Dirac states at differe nt locations in the momentum space. The clone of the Dirac states has bee n observed in our angle-resolved photoemission spectroscopy (ARPES) exper iments. We perform theoretical modelling to illuminate this cloning mecha nism and show the possibility of controllably modifying the electronic sp ectra of two-dimensional atomic crystals by varying the substrate paramet ers.\n\n\nThis seminar will be via Zoom. X-ALT-DESC;FMTTYPE=text/html:<html><head><title></title></head><body><p><s trong>Dr.&nbsp\;Guang Bian<br></strong><strong>Department of&nbsp\;Physic s &amp\; Astronomy<br></strong><b>University of&nbsp\;Missouri</b></p>\n< p>Abstract:</p>\n<p>Tuning interaction between Dirac states in graphene h as attracted great interest because it modifies the spectra of the two-di mensional electron system and\, consequently\, gives rise to novel conden sed-matter phases such as superconductors\, Mott insulators\, Wigner crys tals and quantum anomalous Hall insulators. For example\, emergent superc onductivity occurs in twisted bilayer graphene at magic angles due to the enhanced correlation between Dirac fermions in the two graphene layers. In this work\, we report a new way to engineer the band structure of grap hene\, namely\, cloning Dirac states by the perturbation of substrate pot ential. We grow the graphene epitaxially on 6H-SiC substrate. The SiC sur face potential exerts an incommensurate perturbation to the graphene Dira c bands\, resulting in the duplication of Dirac states at different locat ions in the momentum space. The clone of the Dirac states has been observ ed in our angle-resolved photoemission spectroscopy (ARPES) experiments. We perform theoretical modelling to illuminate this cloning mechanism and show the possibility of controllably modifying the electronic spectra of two-dimensional atomic crystals by varying the substrate parameters.</p> \n<p>This seminar will be via Zoom.</p></body></html> DTSTART;TZID=America/Chicago:20220324T160000 DTEND;TZID=America/Chicago:20220324T170000 SEQUENCE:0 URL:https://physics.missouristate.edu/seminars.htm CATEGORIES:Public,Alumni,Current Students,Faculty,Future Students,Staff END:VEVENT END:VCALENDAR