Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 83: Poster: Graphene (with MA/O)

HL 83.3: Poster

Mittwoch, 2. April 2014, 17:00–20:00, P1

Ultrafast dynamics and photoluminescence of hot carriers in graphene — •Thomas Danz, Andreas Neff, Reiner Bormann, Sascha Schäfer, and Claus Ropers — IV. Physical Institute, University of Göttingen, 37077 Göttingen, Germany

The ultrafast dynamics of optically excited carriers in graphene can be monitored by pump-probe spectroscopy [1,2]. Furthermore, it was recently shown that the thermalization of hot carriers leads to photoluminescence at wavelengths far away from the exciting pump [3,4]. Here, we present the implementation of an experimental setup which combines transient spectroscopy with sub-15-fs temporal resolution with hot carrier photoluminescence detection under the same excitation conditions. With this approach, we aim at a comprehensive picture of the ultrafast carrier response and the disentanglement of the timescales underlying different relaxation pathways. First experimental results will be presented.
[1] J. M. Dawlaty et al., Appl. Phys. Lett. 92, 042116 (2008)

[2] M. Breusing et al., Phys. Rev. B. 83, 153410 (2011)

[3] C. H. Lui et al., Phys. Rev. Lett. 105, 127404 (2010)

[4] W. Liu et al., Phys. Rev. B. 82, 081408 (2010)