Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 76: Graphene: Electronic properties (organized by O)

HL 76.9: Vortrag

Mittwoch, 2. April 2014, 18:00–18:15, WIL C107

Time- and Angle-Resolved Photoemission Studies of Epitaxial Graphene — •Søren Ulstrup1, Jens C. Johannsen2, Federico Cilento3, Alberto Crepaldi3, Michele Zacchigna3, Jill A. Miwa1, Philip D. C. King4, Cephise Cacho5, Edmond Turcu5, Emma Springate5, Felix Fromm6, Christian Raidel6, Thomas Seyller6, Fulvio Parmigiani3, Marco Grioni2, and Philip Hofmann11Aarhus University, Aarhus, Denmark — 2EPFL, Lausanne, Switzerland — 3Sincrotrone Trieste, Trieste, Italy — 4University of St. Andrews, St. Andrews, United Kingdom — 5STFC Rutherford Appleton Laboratory, Didcot, United Kingdom — 6Technical University of Chemnitz, Chemnitz, Germany

Understanding of the ultrafast carrier dynamics in graphene is of central importance for many electronic and optoelectronic applications. With the advent of high harmonic laser-based time- and angle-resolved photoemission (TR-ARPES) it is possible to gain a direct view of the non-equilibrium electronic structure around the Dirac point in graphene with femtosecond time resolution. Here, we characterize the dynamic processes around the Dirac point in epitaxial graphene using TR-ARPES measurements. In particular, we study the time-scales and significance of hot electron thermalization processes and electron-phonon coupling, and address the possibility of carrier multiplication.

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