Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 71: Poster Session: Graphene / Topological Insulators / Interfaces and Surfaces

HL 71.15: Poster

Mittwoch, 28. März 2012, 16:00–19:00, Poster D

The detection of terahertz radiation via graphene based devices at low magnetic field — •Majdi Salman^1,2, Markus Golla², Yu. B. Vasilyev³, Fathi Gouider², Miriam Friedemann⁴, Franz. J Ahlers⁴, Hennrik Schmidt^2,5, Rolf Haug⁵, and Georg Nachtwei² — ¹NTH Nano School for Contacts in Nanosystems, Germany — ²Institut fuer Angewandte Physik, Technische Universitaet Braunschweig, Braunschweig, Germany — ³Ioffe Physical Technical Institute, Russian Academy of Science, St. Petersburg, Russia — ⁴Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — ⁵Institut für Festkörperphysik, Universität Hannover, Appelstraße 2, Hannover, Germany

The influence of a magnetic field on Landau levels (LLs) in graphene-based devices is described via the magneto- optical response induced by terahertz (THz) radiation. For single-layer graphene, the resonance energies of the transitions between the LLs such as L1, L2 and L3, fit quite well to the terahertz spectral range at low magnetic fields. Also, the calculations for the terahertz photoresponse in the in presence of low magnetic field, the reported calculations for the scattering rate of LLs, recent and our primary experimental results of transmission and photoresponse measurements implying that single-layer graphene can be suitable for the detection of terahertz radiation. On the other the hand, temperature dependence of full width at half maximum (FWHM) of infrared transmission measurements were utilized in our calculation to argue that the graphene based devices can be also suitable for the detection of terahertz radiation at room temperature.