Bulletin of the American Physical Society
2009 Joint Spring Meeting of the New England Section of APS and AAPT
Volume 54, Number 5
Friday–Saturday, May 8–9, 2009; Boston, Massachusetts
Session APS2: Condensed Matter |
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Chair: Nathan Israeloff, Northeastern University Room: West Village F 272 |
Saturday, May 9, 2009 8:00AM - 8:12AM |
APS2.00001: Lateral Shear of Gold Nanoparticle-clusters on Self Assembled Monolayers of p-Aminothiophenol Dipti Sharma, Marina Ruths This study explores the shear-induced rearrangements of gold nanoparticles (diameter=30nm) on self-assembled monolayers (SAMs) of $p$-aminothiophenol (ATP), formed on template-stripped gold substrates. The nanoparticles are attached to the SAM through electrostatic attraction. A number of adsorbed gold nanoparticles in the form of nanoclusters can be seen on the surface after 24 hours of immersion time in the gold suspension (concentration=1.28*10$^{-10}$ M). As a nano-force was applied on the nanoclusters with an AFM tip, a shift in the lateral position of the nanoparticles was observed. This shift increases and changes the shape of the nanocluster as the force on the nanoparticles is increased. This shift can be explained in terms of a sliding-rolling model where some nanoparticles roll over their neighbor nanoparticles as the stress increases on the nanocluster. [Preview Abstract] |
Saturday, May 9, 2009 8:12AM - 8:24AM |
APS2.00002: Photon Localization in a nematic Liquid Crystal Jim McClymer, Hayel Shehadeh Over 50 years ago Anderson\footnote{ P. W. Anderson, \textit{Phys. Rev. }\textbf{109}, 1492 (1958). } described a process whereby electrons can be localized due to multiple interference caused by scattering from defects. Nearly 25 years later John\footnote{ S. John, \textit{Phys. Rev. Lett. }\textbf{53}, 2169 (1984). } and Anderson\footnote{ P. W. Anderson, \textit{Philos. Mag. B }\textbf{52}, 505 (1985). } suggested that light can also be localized in highly scattering media. Such highly scattering systems typically have extremely high absorption, complicating efforts to verify localization. We report transmitted light intensity measurements in a nematic liquid crystal that shows clear evidence for strong localization. [Preview Abstract] |
Saturday, May 9, 2009 8:24AM - 8:36AM |
APS2.00003: Magnetron Sputtering of Indium Oxide Tej Pantha, Stephen Arnason We are studying the growth of Indium Oxide by Magnetron sputtering with the intent of controlling the growth condition so as to produce amorphous Indium Oxide. Amorphous Indium Oxide is of interest because it is a low carrier density system with significant disorder. Along with the intermetallic alloys of Molybdenum and Germanium, it is one of the canonical material systems that manifest the superconductor to insulator transition. In addition, close to the superconductor to insulator transition, it shows coulomb glass behavior. This material has been grown previously by reactive ion beam sputtering of metallic Indium in an Oxygen background and thermal evaporation of Indium Oxide. We use magnetron sputtering; RF sputtering from an oxide target and reactive DC sputtering from a metallic Indium target with an oxygen Background. As a preliminary characterization we are measuring the sheet resistance of the resulting films and correlating it with growth conditions, as has been done previously for other growth techniques. [Preview Abstract] |
Saturday, May 9, 2009 8:36AM - 8:48AM |
APS2.00004: Effect of external fields on DPS-DNG layered structure Joseph Shahbazian, Aram Karakashian We have studied theoretically the influence of an applied static field on a periodic heterostructure composed of alternating layers of isotropic DPS (Double Positive index of refraction, SiO$_{2})$ and anisotropic DNG (Double Negative index of refraction). We present theoretical and numerical results of our investigation of the reflection spectra of the visible waves on this structure. This structure works as a bandpass filter, and our evaluation with an applied static magnetic field indicates this structure functions as a tunable optical bandpass filter. The band-gap effect varies with the periodic parameters of the DPS-DNG structure, applied magnetic field, incidence angle and frequency. [Preview Abstract] |
Saturday, May 9, 2009 8:48AM - 9:00AM |
APS2.00005: Theory for Magnetic Resonance Force Microscopy with Ions in a Crystalline Field Thomas Fan, Vladimir Tsifrinovich We have developed theory for the detection of a single spin S$>$1 using magnetic resonance force microscopy (MRFM). The anisotropy caused by the crystalline field is taken into account. The MRFM signal (i.e. the frequency shift of the cantilever vibrations) in the oscillating cantilever- driven adiabatic reversals technique is computed using a semi-classical approach: the spin is treated quantum mechanically, and the cantilever vibrations classically. We have shown that, in the harmonic approximation, the MRFM signal for a spin S$>$1 is the same as for spin S = 1/2. We have obtained the analytical estimate for the half-width of the MRFM signal. [Preview Abstract] |
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