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Topic Area: Condensed Matter Physics

Displaying records 41 to 50 of 111 records.
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41. Effects of magnetism and electric field on the energy gap of bilayer graphene nanoflakes
Topic: Condensed Matter Physics
Published: 1/13/2010
Author: Hongki Min
Abstract: We study the effect of magnetism and perpendicular external electric field strengths on the energy gap of length confined bilayer graphene nanoribbons (or nanobars) using a first principles density functional electronic structure method and a semi-lo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903804

42. Electrical Characterization of Soluble Anthradithiophene Derivatives
Topic: Condensed Matter Physics
Published: 11/19/2009
Authors: Brad Conrad, Calvin Chan, Marsha A. Loth, John E Anthony, David J Gundlach
Abstract: Organic semiconductors remain an active subject for device physics and material science because of their varied electrical properties and potential for low-cost, high-throughput roll-to-roll processing. Several high-mobility oligomers, such as pen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905388

43. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Condensed Matter Physics
Published: 8/6/2009
Authors: Hongki Min, Allan H. MacDonald
Abstract: We predict that the optical conductivity of normal graphene multilayers is close to {sigma}^duni^=({pi}/2) e^u2^/h per layer over a broad range of frequencies. The origin of this behavior is an emergent chiral symmetry which is present in normal N-l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902107

44. Optimization of arrays of gold nanodisks for plasmon-mediated Brillouin light scattering
Topic: Condensed Matter Physics
Published: 7/22/2009
Authors: Ward L Johnson, Sudook A Kim, Zhandos Utegulov, B. T. Draine
Abstract: Distributions of electric fields in two-dimensional arrays of gold nanodisks on a Si3N4 membrane, with light incident through the membrane, are modeled with the aim of determining array geometries for effective plasmon-mediated Brillouin light scat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854474

45. The-Final-State Symmetry of Na 1s Core-shell Excitons in NaCl and NaF
Topic: Condensed Matter Physics
Published: 7/8/2009
Authors: Eric L Shirley, K. P. Nagle, G T Seidler, T. T. Fister, J. A. Bradley, F. C. Brown
Abstract: We report measurements of the Na 1s contribution to the nonresonant inelastic x-ray scattering (NRIXS) from NaCl and NaF. Prior x-ray absorption studies have observed two pre-edge excitons in both materials. The momentum transfer-dependence (q-depe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901581

46. Topological Insulators and Metals in Atomic Optical Lattices
Topic: Condensed Matter Physics
Published: 5/28/2009
Authors: Tudor Stanescu, Victor Galitski, Jay Vaishnav, Charles W Clark, Sankar Das Sarma
Abstract: We propose the realization of topological quantum states with cold atoms trapped in an optical lattice. We discuss an experimental setup that generates a two-dimensional hexagonal lattice in the presence of a light-induced periodic vector potential, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901533

47. Observing the Quantization of Zero Mass Carriers in Graphene
Topic: Condensed Matter Physics
Published: 5/15/2009
Authors: Joseph A Stroscio, Gregory M. Rutter, D. L. Miller, K. Kubista, W. A. de Heer, Phillip N. First
Abstract: Application of a magnetic field to conductors causes the charge carriers to circulate in cyclotron orbits with quantized energies called Landau levels (LLs). These are equally spaced in normal metals and two-dimensional electron gases. In graphene, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901095

48. Time domain measurement of phase noise in a spin torque oscillator
Topic: Condensed Matter Physics
Published: 5/13/2009
Authors: Mark W Keller, Anthony B Kos, Thomas J Silva, William H Rippard, Matthew R Pufall
Abstract: We measure phase noise from the zero crossings of the voltage vs. time waveform of a spin torque nanocontact oscillating in a vortex mode. The power spectrum of the phase noise varies with Fourier frequency f as 1/f^u2^, consistent with frequency ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901711

49. "Negative resistance" errors in four-point measurements of crossed-wire devices
Topic: Condensed Matter Physics
Published: 5/1/2009
Authors: Joshua M Pomeroy, Holger Grube
Abstract: "Negative resistance" errors due to non-uniform current distributions significantly distort the apparent electronic performance of devices formed with crossed wires, demonstrated here by resistance, magneto-resistance, current-volt ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=842581

50. Cryocoolers: State of the art and recent developments
Topic: Condensed Matter Physics
Published: 3/31/2009
Author: Ray Radebaugh
Abstract: Cryocooler performance and reliability are continually improving. Consequently, they are more and more frequently implemented by physicists in their laboratory experiments or for commercial and space applications. The five types of cryocoolers most ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901013



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