Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 91: Poster IIIb (Joint session of DS and HL, organized by HL)
HL 91.7: Poster
Donnerstag, 10. März 2016, 16:00–19:00, Poster A
Population inversion in Landau-quantized graphene — •Samuel Brem1, Florian Wendler1, and Ermin Malic2 — 1Technische Universität Berlin, Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, 10623 Berlin, Germany — 2Chalmers University of Technology, Department of Physics, SE-412 96 Gothenburg, Sweden
In the presence of strong magnetic fields the linear band dispersion of graphene is quantized into non-equidistant Landau levels, which can be selectively excited and probed with circularly polarized light. The extraordinary arrangement of energy levels opens up the possibility to create a population inversion between optically coupled Landau levels of graphene [1]. This is an important prerequisite for the design of a highly tunable Landau level laser in the terahertz regime.
To prove that the predicted population inversion can be exploited to generate coherent laser light, a quantum optical investigation of Landau-quantized graphene in a cavity is performed. Based on the density matrix formalism combined with a tight-binding approach, we study the ultrafast dynamics of Dirac electrons in a magnetic field coupled to the photons in an optical cavity. This approach allows us to address the question whether the emission of coherent laser light in a graphene-based Landau level laser is possible.
[1] F. Wendler, and E. Malic, Sci. Rep. 5:12646 (2015)