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Topic Area: Condensed Matter Physics
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Displaying records 101 to 110.
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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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901711

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, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901533

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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620307

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- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620441

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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32940

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 T. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910037

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 T. 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 - ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904322

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 T. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911061

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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910994

110. Weak versus Strong Coupling Theory for Bi^d2^Sr^d2^CaCu^d2^O^d8^
Topic: Condensed Matter Physics
Published: 1/1/1990
Authors: Marvin Cohen, David R. Penn
Abstract: ^d^^d^^d^^d^ The latest optical determination of the superconducting-gap function for Bi^d2^Sr^d2^CaCu^d2^O^d8^ is consistent with weak-coupling theory. In contrast, a large discontinuity in heat-capacity data suggests strong-coupling superconductivi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=620366



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