Bulletin of the American Physical Society
2007 New England Section of the APS and AAPT Joint Fall Meeting
Volume 52, Number 17
Friday–Saturday, October 19–20, 2007; Storrs, Connecticut
Session B1: APS Plenary Session II |
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Chair: Joseph Budnick, University of Connecticut Room: MSB PB-36 |
Friday, October 19, 2007 3:00PM - 4:00PM |
B1.00001: Relativistic Quantum Physics at Your Pencil Tips: Dirac Fermion in Graphitic Carbon Invited Speaker: The massless Dirac particle moving at the speed of light has been a fascinating subject in relativistic quantum physics. Graphene, an isolated single atomic layer of graphite, now provides us an opportunity to investigate such exotic effect in low-energy condensed matter systems. The unique electronic band structure of graphene lattice provides a linear dispersion relation where the Fermi velocity replaces the role of the speed of light in usual Dirac Fermion spectrum. In this presentation I will discuss experimental consequence of charged Dirac Fermion spectrum in two representative low dimensional graphitic carbon systems: 1-dimensional carbon nanotubes and 2-dimensional graphene. Combined with semiconductor device fabrication techniques and the development of new methods of nanoscaled material synthesis/manipulation enables us to investigate mesoscopic transport phenomena in these materials. The exotic quantum transport behavior discovered in these materials, such as room temperature ballistic transport and unusual half-integer quantum Hall effect. In addition, the promise of these materials for novel electronic device applications will be discussed. [Preview Abstract] |
Friday, October 19, 2007 4:00PM - 5:00PM |
B1.00002: Optical Spectroscopy and Dynamics in Carbon Nanotubes Invited Speaker: Single-walled carbon nanotubes constitute nearly ideal one-dimensional material systems. These materials offer a variety of well-defined atomic structures, ready access to nanometer dimensions, and very high aspect ratios. In addition to the fundamental interest in this topic, understanding the spectroscopy and optical interactions of these material systems is critical for the characterization of nanotubes and for progress in potential optoelectronic applications. In this paper we describe recent advances in probing the nature and dynamics of excited states in single-walled carbon nanotubes. Recent advance in both ultrafast measurements and optical spectroscopy of individual nanotubes will be presented. These approaches have permitted us to determine exciton binding energies in different nanotube structures, to obtain optical spectra of nanotubes of independently determined atomic structure, and to examine environmental effects on individual nanotubes. [Preview Abstract] |
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