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Topic Area: Physics

Displaying records 51 to 60 of 644 records.
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51. Determination of graphene work function and graphene-insulator-semiconductor band alignment by internal photoemission spectroscopy
Topic: Physics
Published: 7/11/2012
Authors: Rusen Yan, Qin Zhang, Wei Li, Irene G. Calizo, Tian T. Shen, Curt A Richter, Angela R Hight Walker, Xuelei X. Liang, David J Gundlach, Nhan V Nguyen, Huili Grace Xing, Alan Seabaugh
Abstract: We determined the band alignment of a graphene-oxide-silicon structure using internal photoemission spectroscopy. From the flatband voltage and Dirac voltage we infer a 4.3  10e11 cm-2 negative extrinsic charge present on the graphene surface. Als ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911396

52. Propagation of Vortex Electron Wave Functions in a Magnetic Field
Topic: Physics
Published: 7/5/2012
Authors: Gregg M. Gallatin, Ben McMorran
Abstract: The physics of coherent beams of photons carrying axial orbital angular momentum (OAM) is well understood and such beams, sometimes known as vortex beams, have found applications in optics and microscopy. Recently electron beams carrying very large ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910775

53. 100 Years of Superconductivity
Topic: Physics
Published: 7/2/2012
Author: Richard Lloyd Kautz
Abstract: The 100th anniversary of the discovery of superconudctivity by Heike Kamerlingh Onnes was celebrated in 2011 at the Superconductivity Centennial Conference held in The Hague. 100 Years of Superconductivity is a product of that celebration, but it's f ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911194

54. In-situ Polarized 3He system for the Magnetism Reflectometer at the Spallation Neutron Source
Topic: Physics
Published: 7/2/2012
Authors: Thomas R Gentile, X Tong, C Y Jiang, V Lauter, H. Ambaye, D. Brown, L Crow, R J Goyette, W-T Lee, A. Parizzi
Abstract: We report on the in-situ polarized 3He neutron polarization analyzer developed for the time-of-flight Magnetism Reflectometer (MAGICS) at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). Using the spin exchange optical ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911438

55. International time and frequency comparisons in real time: recent results
Topic: Physics
Published: 7/2/2012
Authors: Michael A Lombardi, J. Mauricio Lopez-Romero, Nelida Diaz-Munoz, Eduardo de Carlos Lopez
Abstract: Within the Sistema Interamericano de Metrologia (SIM) region, a time comparison network, SIMTN, has been developed. The SIMTN continuously compares the time scales of SIM members and publishes measurement results in near real-time. The measurements ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910612

56. Randomized Benchmarking of Multiqubit Gates
Topic: Physics
Published: 6/29/2012
Authors: John P Gaebler, Adam Matthias Meier, Ting Rei Tan, Ryan Steven Bowler, Yiheng Lin, David Hanneke, John D. Jost, Jonathan Home, Emanuel H Knill, Dietrich G Leibfried, David J Wineland
Abstract: As experimental platforms for quantum information processing continue to mature, characterization of the quality of unitary gates that can be applied to their quantum bits (qubits) becomes essential. Eventually, the quality must be sufficiently high ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910928

57. Generation of a 660–2100 nm laser frequency comb based on an erbium fiber laser
Topic: Physics
Published: 6/15/2012
Authors: Gabriel George Ycas, Steve Osterman, Scott A Diddams
Abstract: We present a laser frequency comb based upon a 250 MHz mode-locked erbium fiber-laser that spans more than 300 terahertz of bandwidth, from 660 nm to 2000 nm. Broad bandwidth is achieved by making use of Er:fiber and Yb:fiber amplifiers and supercont ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910674

58. Sub-femtosecond absolute timing jitter with a 10 GHz hybrid photonic-microwave oscillator
Topic: Physics
Published: 6/7/2012
Authors: Tara Michele Fortier, Craig W Nelson, Archita Hati, Franklyn J Quinlan, Jennifer A. Taylor, Haifeng (Haifeng) Jiang, Chin W. Chou, Till P Rosenband, Nathan D. Lemke, Andrew D Ludlow, David Allan Howe, Christopher W Oates, Scott A Diddams
Abstract: We present an optical-electronic approach to generating microwave signals with high spectral purity. By overcoming shot noise and operating near fundamental thermal limits, we demonstrate 10 GHz signals that have timing deviation from an ideal period ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910632

59. Three-dimensional real-time tracking of nanoparticles at an oil-water interface
Topic: Physics
Published: 6/5/2012
Authors: Kan K. Du, James Alexander Liddle, Andrew J. Berglund
Abstract: We show that real-time feedback control can be used to study three-dimensional nanoparticle transport dynamics. We apply the method to study the behavior of adsorbed nanoparticles at a silicone oil-water interface in a microemulsion system over a ran ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910474

60. Spectroscopy and Thermometry of Drumhead Modes in a Mesoscopic Trapped-Ion Crystal Using Entanglement
Topic: Physics
Published: 5/25/2012
Authors: Brian C Sawyer, Joseph Wright Britton, Adam Keith, C.-C Joseph Wang, James K. Freericks, Hermann Uys, Michael Biercuk, John J Bollinger
Abstract: We demonstrate a method of sensitive detection and thermometry of individual modes in cold (^dsim^1 mK), planar one-component ion plasmas. Exploiting precise control over the valence electron spins of several hundred crystallized ^u9^Be^u+^ confined ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910453