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TT: Fachverband Tiefe Temperaturen

TT 78: Graphene: Electronic Properties (organized by O)

TT 78.9: 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 Hofmann¹ — ¹Aarhus 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.