J. Kono and L. G. Booshehri (Rice University). NHMFL-PFF: C. H. Mielke, D. Rickel, and S. Crooker.

1. Graphene beyond 100 teslaGregory S. Boebinger, Florida State University, DMR 0654118Pulsed Field Facility The infrared laser transmission as a function of magnetic field in a single layer of carbon atoms (known as “graphene”) indicates the band filling as some of the transmitted light is absorbed in a resonance condition at a particular magnetic field (see figure). A broad minima is observed in the transmission near 60 tesla. The polarity of the carriers is determined by using circularly polarizing the light. In samples of graphene this has proven to be an important capability. Also, since the laser wavelength and the resonance field are accurately determined during the experiment, the Fermi energy can be precisely measured. This helps researchers understand how to tune the material properties. The Cyclotron resonance in single layer graphene taken at room temperature using a 10.6 micron laser and the Single Turn Magnet system. J. Kono and L. G. Booshehri (Rice University). NHMFL-PFF: C. H. Mielke, D. Rickel, and S. Crooker.

2. Graphene beyond 100 teslaGregory S. Boebinger, Florida State University, DMR 0654118Pulsed Field Facility Researchers interested in making graphene into a functional material (such as detectors, solid state switches, or THz sources) can use cyclotron resonance to determine the Fermi energy of this two-dimensional system. The top plot shows a sample that was measured as received, the clear resonance near 60 tesla tells us the polarity and energy level of the carriers. The lower left plot shows that the material has been altered and carriers of both polarities are detected. Subsequent measurements of the same single layer graphene sample, showing that the nature of the dominant carriers are modified. J. Kono and L. G. Booshehri (Rice University). NHMFL-PFF: C. H. Mielke, D. Rickel, and S. Crooker.