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Topic Area: Condensed Matter Physics

Displaying records 41 to 50 of 106 records.
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41. 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

42. 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

43. 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

44. "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

45. 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

46. Polaron Formation in the Optimarlly Doped Ferromagnetic Maganites La^d0.7^Sr^d0.3MnO^d3^ and La^0.7Bx^0.3MnO^d3^
Topic: Condensed Matter Physics
Published: 12/17/2008
Authors: Ying Chen, Benjamin Ueland, Jeffrey W Lynn, G.L. Bychkov, S.N. Barilo, Y.M. Mukovskii
Abstract: The nature of the polarons in the optimally doped colossal magnetoresistive (CMR) materials La^d0.7^Ba^d0.3^ (LBMO and La^d0.7^Sr^d0.3^MnO^d3^ (LSMO is studied by elastic and inelastic neutron scattering. In both materials, dynamic nanoscale polaron ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900145

47. Josephson phase qubit circuit for the evaluation of advanced tunnel barrier materials
Topic: Condensed Matter Physics
Published: 11/21/2008
Authors: Jeffrey S. Kline, Haohua Wang, Seongshik Oh, John M Martinis, David P Pappas
Abstract: We have found that crystalline Josephson junctions have critical current density control problems which decrease circuit yield. We present a qubit circuit designed to accommodate a factor-of-five variation in critical current density for the evaluati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33165

48. Surviving the Transition
Topic: Condensed Matter Physics
Published: 10/31/2008
Author: Kristian Helmerson
Abstract: Observations of the birth of a superfluid have uncovered details of the microphysics of phase transitions. Whether these results can be used to model such trnsitions in the early Universe is an open question.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900230

49. 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

50. Shear Thinning Near the Critical Point of Xenon
Topic: Condensed Matter Physics
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=830987



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