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TT: Fachverband Tiefe Temperaturen

TT 107: Graphene: Electronic Structure (jointly with O, HL)

TT 107.8: Vortrag

Donnerstag, 19. März 2015, 16:45–17:00, MA 041

Luminescence of Graphene in the Visible Spectral Range after Short-Pulse Excitation in the Near Infrared — •Martin Rothe, Günter Kewes, Nikolai Severin, Jürgen P. Rabe, and Oliver Benson — Department of Physics and IRIS Adlershof, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany

Graphene is well known for its unique electronic and optical properties. The study and manipulation of its nonlinear optical response at energies in the range of visible light is of interest for the understanding of its charge carrier dynamics in this energy regime [1]. We find a broad luminescence of graphene and graphene multilayers in the entire visible spectral range after excitation with fs laser pulses in the near infrared. The spectrum that starts even above twice the excitation energy indicates multi-photon absorption or efficient electron scattering processes. This method of luminescence excitation is not only well suited for imaging with high contrast but can also gain insight into fundamental electron relaxation and collective excitation processes [2].

[1] Liu, et al., Phys Rev B: 82, 081408 (2010)

[2] Lange, et al., arXiv:1404.6518 (2014)