1. Condensed-Matter Physics & Materials Science Seminar

    "Magneto-optics and plasmonics of graphene on SiC"

    Presented by Alexey B. Kuzmenko, University of Geneva, Switzerland

    Thursday, February 27, 2014, 1:30 pm
    Bldg. 734, ISB Seminar Room 201 (upstairs)

    Hosted by: Christopher Homes

    Graphene attracts much attention as a two-dimensional material, where electromagnetic absorption and plasmon propagation are highly sensitive to external electric and magnetic fields. In particular, graphene shows giant magneto-optical effects [1,2], which are equally useful for fundamental studies/characterization and promising for optoelectronic applications. In this talk, I'll overview our recent magneto-optical and plasmonic experiments on single- and multilayer graphene grown epitaxially on silicon carbide [2-6]. They include broadband (IR-THz) magneto-optical spectroscopy and scanning near-field microscopy (SNOM) with AFM-like resolution. We found that plasmon scattering on steps between atomically flat substrate terraces affects dramatically optical and magneto-optical properties of graphene [4,5]. Our measurements suggest that graphene plasmon propagation can be tailored using extremely compact nanostructures, such as nanometer-wide gaps [5]. [1] M. L. Sadowski et al., Phys. Rev. Lett. 97, 266405 (2006). [2] I. Crassee et al, Nature Physics 7, 48 (2011). [3] I. Crassee et al., Phys. Rev. B 84, 035103 (2011). [4] I. Crassee et al., Nano Letters 12, 2470 (2012). [5] J. Chen et al., Nano Letters , 13, 6210 (2013). [6] N. Ubrig et al., Optics Express 21, 24736 (2013).