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Displaying records 101 to 110 of 111 records.
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101. 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 ...

102. 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, ...

103. Total Dielectric Function: Algebraic Sign, Electron-Lattice Response, and Superconductivity
Topic: Condensed Matter Physics
Published: 8/1/1988
Authors: P Allen, Marvin Cohen, David R. Penn
Abstract: The interaction between two test charges in a solid can be described in terms of a total dielectric function that includes electronic and lattice polarization. Crystal stability requires the eigenvalues of {epsilon}^u-1^ to be <= 1. Some implicati ...

104. Total-dielectric-function Approach to Electron and Phonon Response in Solids
Topic: Condensed Matter Physics
Published: 1/1/1995
Authors: David R. Penn, S Lewis, Marvin Cohen
Abstract: The interaction between two test charges, the response of a solid to an external field, and the normal modes of the solid can be determined from a total dielectric function that includes both electronic and lattice polarizabilities as well as local- ...

105. Ultra-high resolution alpha particle spectroscopy using calorimetry
Topic: Condensed Matter Physics
Published: 9/23/2008
Authors: Robert Daniel Horansky, Joel Nathan Ullom, James A Beall, Gene C Hilton, Kent D Irwin, Don Dry, Beth Hastings, Stephen Lamont, Clifford R Rudy, Michael W Rabin
Abstract: Calorimetry has been used since the late 1700?s to measure the heat output of physical processes ranging from chemical reactions to the respiration of organisms . Calorimetry is performed by measuring the temperature change caused by heat release int ...

106. Ultrafast Demagnetization Measurements using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions
Topic: Condensed Matter Physics
Published: 1/23/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Margaret M. Murnane, Henry C. Kapteyn, Chan La-O-Vorakiat, Stefan Mathias, Emrah Turgut, Teale A. Carson, Martin Aeschlimann, Claus M. Schneider
Abstract: Ultrashort pulses of extreme ultraviolet light from high-harmonic generation are a new tool for probing coupled charge, spin, and phonon dynamics with element specificity, attosecond pump-probe synchronization, and time resolution of a few-femtosecon ...

107. Ultrafast element-specific magnetization Dynamics of complex magnetic materials on a table-top
Topic: Condensed Matter Physics
Published: 12/21/2012
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Chan La-O-Vorakiat, Henry C. Kapteyn, Margaret M. Murnane, Stefan Mathias, Roman Adam, Patrik Grychtol, Martin Aeschlimann, Claus M. Schneider, Emrah Turgut, Dennis Rudolf
Abstract: We review recent progress in femtosecond magnetization dynamics probed by extreme ultraviolet pulses from high-harmonic generation. In a transverse magneto-optical Kerr geometry, we establish an ultrafast, element-specific experimental capability - ...

108. Ultrafast manetization enhancement in metallic multilayers driven by superdiffusive spin current
Topic: Condensed Matter 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 ...

109. Valleytronics, Carrier Filtering and Thermoelectricity in Bismuth: Magnetic Field Polarization Effects
Topic: Condensed Matter Physics
Published: 9/25/2012
Authors: Adrian Popescu, Lilia Woods
Abstract: Valley polarization of multi-valleyed materials is of significant interest for potential applications in electronic devices. The main challenge is removing the valley degeneracy in some controllable way. The unique properties of bismuth in terms of i ...

110. Weak Localization, Spin Relaxation, and Spin-Diffusion: Crossover Between Weak and Strong Rashba Coupling Limits
Topic: Condensed Matter Physics
Published: 9/17/2014
Authors: Yasufumi Araki, Guru Bahadur S Khalsa, Allan H. MacDonald
Abstract: Disorder scattering and spin-orbit coupling are together responsible for the diffusion and relaxation of spin-density in time-reversal invariant systems. We study spin-relaxation and diffusion in a two-dimensional electron gas with Rashba spin-orbit ...

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