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Displaying records 71 to 80 of 250 records.
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71. Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current
Topic: Physics
Published: 9/4/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Dennis Rudolf, Chan La-O-Vorakiat, Marco Battiato, Roman Adam, Emrah Turgut, Stefan Mathias, Margaret M. Murnane, Henry C. Kapteyn, Claus M. Schneider
Abstract: Uncovering the physical mechanisms that govern ultrafast charge and spin dynamics is crucial for understanding correlated matter as well as the fundamental limits of ultrafast spin-based electronics. Spin dynamics in magnetic materials can be driven ...

72. 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 Q. 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 ...

73. 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 ...

74. 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 ...

75. Ancilla assisted calibration of a measuring apparatus
Topic: Physics
Published: 6/19/2012
Authors: Alan L Migdall, Giorgio Brida, L. Ciavarella, Ivo Pietro Degiovanni, Marco Genovese, M. G. Mingolla, M. G. A. Paris, Fabrizio Piacentini, S. V. Polyakov
Abstract: The rapid development of quantum systems has enabled a wide range of novel and innovative technologies, from quantum information processing to quantum etrology and imaging [1{13], mainly based on optical systems. Precise characterization techniques o ...

76. The water-vapor self- and water-nitrogen continuum absorption in the 1000 and 2500 cm-1 atmospheric windows
Topic: Physics
Published: 6/13/2012
Authors: Yuri I. Baranov, Walter Joseph Lafferty
Abstract: The pure water-vapor and water-nitrogen continuum absorption in the 1000 and 2500 cm-1 atmospheric windows has been studied using a 2 m base-length White-type multipass cell coupled to a BOMEM DA3- 002 FTIR spectrometer. The measurements were carr ...

77. 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 ...

78. Matrix-based color measurement corrections of tristimulus colorimeters
Topic: Physics
Published: 4/20/2012
Authors: George P Eppeldauer, Z. T. Kosztyan, J. D. Schanda
Abstract: For image taking colorimetry the tristimulus technique is still the best practical method to keep the measurement time within reasonable limits. However, the achievable color measurement uncertainties for special sources can be significant because of ...

79. Significantly Improved Trapping Lifetime of Nanoparticles in an Optical Trap using Feedback Control
Topic: Physics
Published: 4/10/2012
Authors: Arvind Kumar Balijepalli, Thomas W LeBrun, Jason John Gorman
Abstract: We demonstrate an increase in trapping lifetime for optically trapped nanoparticles by more than an order of magnitude using feedback control. This has been demonstrated through simu- lation and experimental results for 100, nm gold particles and 3 ...

80. Quantum interface between an electrical circuit and a single atom
Topic: Physics
Published: 3/30/2012
Authors: Jacob M Taylor, Dvir Kafri, David Kielpinski, G J Milburn, M J Woolley
Abstract: Atomic systems are remarkably well suited to storage and processing of quantum information. However, their properties are tightly constrained by physical law, causing difficulties in interfacing to optical or electronic devices. On the other hand, q ...

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