Bulletin of the American Physical Society
Spring 2018 Meeting of the APS New England Section
Volume 63, Number 9
Friday–Saturday, March 16–17, 2018; Boston, Massachusetts
Session D02: Materials Physics |
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Room: 20 Somerset 215 |
Saturday, March 17, 2018 10:15AM - 10:27AM |
D02.00001: Growth of magnetic nanowires along freely selectable $\langle $hkl$\rangle $ crystal directions Ye Tao, Christian Degen The production of nanowire materials, uniformly oriented along any arbitrarily chosen crystal orientation, is an important, yet unsolved, problem in material science. Here, we present a generalizable solution to this problem. The solution is based on the technique of glancing angle deposition combined with a rapid switching of the deposition direction between crystal symmetry positions. Using iron--cobalt as an example, we showcase the simplicity and capabilities of the process in one-step fabrications of $\langle $100$\rangle $, $\langle $110$\rangle $, $\langle $111$\rangle $, $\langle $210$\rangle $, $\langle $310$\rangle $, $\langle $320$\rangle $, and $\langle $321$\rangle $-oriented nanowires, three-dimensional nanowire spirals, core--shell heterostructures, and axial hybrids. Our results provide a new capability for tailoring the properties of nanowires, and should be generalizable to any material that can be grown as a single-crystal biaxial film. [Preview Abstract] |
Saturday, March 17, 2018 10:27AM - 10:39AM |
D02.00002: The Synthesis and Characterization of Indium-doped Tin Telluride Nanowires Julia Wei, Pengzi Liu, Judy Cha Tin telluride (SnTe) is a topological crystalline insulator that possesses robust surface electron states that are spin-polarized and Dirac-dispersive. Doping SnTe with indium (In) induces superconductivity and yields a candidate topological superconductor that is potentially suitable for fault-tolerant quantum computation. We are interested in using transport measurements to investigate the topological metallic surface states of In-doped SnTe and the superconducting phase transition in these surface states. We study In-doped SnTe nanowires in particular because their high surface to volume ratio enhances surface-state effects and enables phase-sensitive transport measurements; importantly, nanowires are also expected to host Majorana fermions. The results from our synthesis of In-doped SnTe nanowires will be shown. We have also characterized the topography and composition of the nanowires using low-voltage scanning electron microscopy and energy-dispersive X-ray spectroscopy. Currently, electronic transport properties on these nanowires are being measured by fabricating nanodevices. [Preview Abstract] |
Saturday, March 17, 2018 10:39AM - 10:51AM |
D02.00003: Increase of Memory Storage in Silver doped Glassy Alloy D Sharma In this recent work, light is shown how memory storage of silver doped SeIn glassy alloys is increased and how this material shows dynamic behavior. The presence of electric field across the material is observed as a function of frequency ranging from 500 Hz to 500 kHz. The SeIn alloy is studied for composition of Se90In8Ag2 and shows the presence of one plateau at lower frequency from 500 Hz - 5 Hz in the real part of dielectric constant and shows two plateaus for higher frequencies from 5 kHz - 500 kHz. The imaginary part of dielectric relaxation shows two dynamic peaks for higher frequencies with an indication of having larger memory storage and makes this glassy alloy useful for memory storage devices for higher frequencies. Keywords: Memory storage, dynamic behavior, glassy alloy, electric behavior silver. [Preview Abstract] |
Saturday, March 17, 2018 10:51AM - 11:03AM |
D02.00004: Confinement: the essential property for biomimicry Cecile Malardier-Jugroot, Matt McTaggart, Manish Jugroot In the past decades, nanotechnology has been one of the most prolific research area opening new avenues for applications in larger part due to the novel physical properties unveiled at the nanoscale. We will present in detail the development of efficient nanoreactors mimicking biological systems by combining confinement effect and high catalytic activities with gold as catalytic center. The fine structure of the polymeric template forming the shell of the nanoreactor was shown to be molecular weight dependent [1] and allows the control of a 2D or 1D confinement [2,3]. The characterization of the nanoreactor structural properties combined molecular modelling, TEM, SEM, X-RD, Small Angle Neutron Scattering, DLS and UV-Vis. The structure of the gold catalyst is dependent on the hydrophobicity of the cavity surrounding the metal with nanoclusters (2.5nm) produced in hydrohopbic cavities and monoatomically thin layers in the hydrophilic cavities of the nanoreactors. The catalytic activity of Au was characterized with a model reaction: pyrrole polymerization and revealed a superior activity compared to Pt. [1] Chem. Phys. Let., 2015, 636, 216 [2] Langmuir, 2005, 21 (22), 10179 [3] Mat. Chem. and Phys, 2017, 196, 92 [Preview Abstract] |
Saturday, March 17, 2018 11:03AM - 11:15AM |
D02.00005: Noise-controlled chemical fluxes and pathways Jean-Sebastien Gagnon, David Hochberg, Juan Perez-Mercader We investigate the effect of externally tunable noise on the behavior of a simple chemical reaction network model. By combining powerful techniques from the renormalization group and from stoichiometric network analysis, we show that the renormalization of chemical parameters (such as decay and reaction rates) induces a renormalization of extreme chemical fluxes and stationary concentrations. This method thus provides the means to explore the impact that noise has on the chemical fluxes and pathways directly, thus demonstrating how externally tunable noise may be used to control, promote and optimize chemical progress through a given pathway. [Preview Abstract] |
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