Seminar
Tuesday, 26 January, 2010
Group seminar MPQ: Searching for Massless Dirac Fermions in Flatland
Tuesday, 26.01.2010 10 a.m. (s.t.) in Herbert-Walther-lecture room, MPQ Garching
Çağlar Girit, Zettl Research Group, University of California
Graphene, a two-dimensional carbon allotrope, has interesting electronic properties resulting from its unique hexagonal monoatomic lattice. Quasiparticles in graphene are massless Dirac fermions and they have been detected experimentally by various means. I will discuss experiments to detect them in the ballistic electronic transport regime. First, I will overview the synthesis of graphene and its physical characterization by methods such as transmission electron microscopy and Raman spectroscopy. Next I will discuss ballistic Dirac fermion detection in graphene by quantum point contacts, Josephson junctions, and "short-and-wide" junctions. Finally, I will summarize progress towards fabrication of arrays of suspended ultrashort CVD graphene junctions and present possible applications of ballistic graphene devices.