Bulletin of the American Physical Society
Joint Spring 2016 Meeting of the Texas Sections of APS, AAPT, and Zone 13 of the SPS
Volume 61, Number 3
Thursday–Saturday, March 31–April 2 2016; Beaumont, Texas
Session E1: APS Plenary Session III |
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Chair: Howard Lee, Baylor University and Texas A&M - College Station Room: Ballroom |
Saturday, April 2, 2016 8:15AM - 8:55AM |
E1.00001: Surfaces -- Condensed Matter Physics in Accessible Systems Invited Speaker: Paul Snijders Low-dimensional electron systems are at the heart of some of the most exciting discoveries in condensed matter research. Quantized Hall effects in semiconductor quantum wells, graphene, and magnetic topological insulators, and unconventional superconductivity in cuprates and iron pnictides are transformational discoveries that define the frontiers of condensed matter science. The emergence of these phenomena arises from the competition between the charge, lattice, and spin degrees of freedom such that small changes in external parameters can alter the qualitative features of the many-body system. Surfaces and interfaces are ideal platforms for studying these interactions because the atomic and electronic structure can be studied in both real and reciprocal space with atomic resolution. In this talk, I will describe some of our past and current work using surface science approaches to study emergent phases on silicon surfaces. Our discussion will run the gamut from magnetic order in surface Si orbitals, to the emergence of a doping-induced surface phase transition, and the observation of quasiparticle peaks in a doped triangular Mott-Hubbard insulator built upon a Si surface. [Preview Abstract] |
Saturday, April 2, 2016 8:55AM - 9:35AM |
E1.00002: Tailoring properties of single layer transition metal dichalcogenides: looking beyond graphene Invited Speaker: Talat Rahman Single-layer of molybdenum disulfide (MoS$_{\mathrm{2}})$ and other transition metal dichalcogenides appear to be promising materials for next generation nanoscale applications (optoelectronic and catalysis), because of their low-dimensionality and intrinsic direct band-gap which typically lies in the visible spectrum. Several experimental groups have already reported novel electronic and transport properties which place these material beyond graphene for device applications. MoS$_{\mathrm{2\thinspace }}$is known to be a leading hydrodesulfurization catalyst. Efforts are underway to further tune these optoelectronic and catalytic properties through alloying, defects, doping, coupling to a substrate, and formation of bilayer stacks (homo- and hetro-structures). In this talk I will present results from joint theoretical and experimental investigations [1-3] which provide a framework for manipulating the functionality of this \textit{wundermaterial} and take us closer to the goal of rational material design. My emphasis will be on the structural, optical and catalytic properties of pure and defect-laden single layer MoS$_{\mathrm{2\thinspace }}$and their possible technological applications. [1] D. Sun, et al., Angew. Chem. Int. Ed. 51, 10284 (2012). [2] D. Le, T. B. Rawal, and T. S. Rahman, J. Phys. Chem. C 118, 5346 (2014). [3] T. Komesu, D. Le, et al., App. Phys. Lett. 105, 241602 (2014). [Preview Abstract] |
Saturday, April 2, 2016 9:35AM - 10:15AM |
E1.00003: What makes the proton spin?. Invited Speaker: Carl A. Gagliardi For the past 30 years, there has been an intense world-wide effort to understand how the quarks and gluons that make up the proton organize themselves to produce its spin of 1/2 hbar. ~The primary tool in this quest has been deep-inelastic scattering of polarized electrons and muons off polarized protons. ~A surprising discovery has been that the spins of the quarks and anti-quarks only contribute \textasciitilde 1/3 of the proton spin. ~During the past decade, the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Lab has enabled a new, complementary probe, high-energy polarized pp collisions. ~The RHIC spin program has provided essential new insights, including evidence that the gluons in the proton are polarized and may even contribute a larger fraction of the proton spin than the quarks do. ~In this talk, I'll discuss what we've learned from the RHIC spin program, and where we are heading over the next several years. [Preview Abstract] |
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