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 .  M. L. Sadowski et al., Phys. Rev. Lett. 97, 266405 (2006).  I. Crassee et al, Nature Physics 7, 48 (2011).  I. Crassee et al., Phys. Rev. B 84, 035103 (2011).  I. Crassee et al., Nano Letters 12, 2470 (2012).  J. Chen et al., Nano Letters , 13, 6210 (2013).  N. Ubrig et al., Optics Express 21, 24736 (2013).