Bulletin of the American Physical Society
81st Annual Meeting of the APS Southeastern Section
Volume 59, Number 18
Wednesday–Saturday, November 12–15, 2014; Columbia, South Carolina
Session HD: Condensed Matter Physics III |
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Chair: Richard Haglund, Vanderbilt University Room: Richland III |
Friday, November 14, 2014 11:00AM - 11:36AM |
HD.00001: Probing emission and plasmons in nanostructures in a scanning transmission electron microscope through combined spectroscopies Invited Speaker: Jordan Hachtel The optical behavior of nanostructured materials is of significant interest across a variety of fields. Plasmonics and their relationship with emitters in nanoscale devices allow us to control light in a useable manner below the coherence. By understanding the nature of both emission and plasmonics at the local level we can move towards unlocking the full potential photonic devices. To this end we examine emitting ZnO nanowires with an insulating MgO shell that are decorated with plasmonic Ag nanoparticles. The tool used to study these structures is a scanning transmission electron microscope equipped for cathodoluminescence spectroscopy and electron energy loss spectroscopy alongside high resolution annular dark field imaging. The confluence of these different methodologies allow us to understand the nature of the plasmons and emissions in the ZnO structures at the nanometer level, and give us new ways to study optical properties at the nanoscale. [Preview Abstract] |
Friday, November 14, 2014 11:36AM - 12:12PM |
HD.00002: Electronic Properties of Graphene: Insights from Atomistic Calculations Invited Speaker: Marcelo Kuroda First principles calculations have become useful tools to understand, predict and model the physical properties of material systems. Their predictive capabilities combined with the continuously growing computational power have turned them into computational microscopes invigorating the dialogue between theory and experiment. In this talk I will show how these calculations can be used to study the electronic properties of graphene such as charge screening and contact resistance [1-3]. Owing to its outstanding physical properties this two-dimensional material system has attracted lot of attention not only for basic science but also technological applications.\\[4pt] [1] M.A. Kuroda et al., ``Conductance through Multilayer Graphene Films,'' Nano Lett.~{\bf11}, 3629 (2011).\\[0pt] [2] M.A. Kuroda et al., ``Nonlinear Screening in Multilayer Graphene Systems,'' Phys.~Rev.~Lett.~{\bf106}, 116804 (2011).\\[0pt] [3] M.A. Kuroda et al., ``Optimal Thickness for Charge Transfer in Multilayer Graphene Electrodes,'' Phys.~Rev.~Appl.~{\bf1}, 14005 (2014). [Preview Abstract] |
Friday, November 14, 2014 12:12PM - 12:48PM |
HD.00003: TBD Invited Speaker: Johannes Abate |
Friday, November 14, 2014 12:48PM - 1:00PM |
HD.00004: Universal Behavior of Linear Magnetoresistance in Carbon Inverse Opal Lei Wang, Ming Yin, Timir Datta Magneto-transport of carbon inverse opal structures was investigated in the magnetic field up to B$=$9.4K at various temperatures from 2K to 50K. The transverse magnetoresistance displays linear dependence on the magnetic field instead of quadratic characteristic with the increase of the field. The linear magnetoresistance (LMR) is demonstrated to be proportional to the carrier mobility. Interesting, all the MR data as a function of B/T lies in a single curve, showing a universal behavior. Due to the peculiar structures of sample, the longitudinal magnetoresistance, which is usually very small, exhibits the same value as the transverse magnetoresistance, displaying the identical universal behavior. [Preview Abstract] |
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