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You searched on: Topic Area: Physics Sorted by: date

Displaying records 41 to 50 of 301 records.
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41. Phase-Sensitive Detection of Spin Pumping via the ac Inverse Spin Hall Effect
Topic: Physics
Published: 10/6/2014
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Mathias A. Weiler
Abstract: Sources of pure spin currents are a fundamental building block of spintronic devices. In ferromagnet/normal metal heterostructures, spin currents are generated at ferromagnetic resonance. This is known as spin pumping, where spin currents of both ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915317

42. Cryogenic Design and Performance of an Apparatus for Magnetically Trapping Ultracold Neutrons
Topic: Physics
Published: 10/5/2014
Author: Hans P Mumm
Abstract: The cryogenic design and performance of an apparatus used to magnetically confine ultracold neutrons (UCN) is presented. The apparatus is part of an effort to measure the beta-decay lifetime of the free neutron and is comprised of a high-current su ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917558

43. High-efficiency WSi superconducting nanowire single-photon detectors operating at 2.5 K
Topic: Physics
Published: 9/24/2014
Authors: Varun Boehm Verma, Boris Korzh, Felix Bussieres, Robert D Horansky, Adriana E Lita, Francesco Marsili, Hugo Zbinden, Richard P Mirin, Sae Woo Nam
Abstract: We demonstrate that superconducting nanowire single photon detectors (SNSPDs) fabricated from amorphous WSi may be operated with > 75 % system detection efficiency at a temperature approaching seventy percent of the superconducting transition tem ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915661

44. Weak Localization, Spin Relaxation, and Spin-Diffusion: Crossover Between Weak and Strong Rashba Coupling Limits
Topic: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916181

45. Photon-number uncertainty in a superconducting transition-edge sensor beyond resolved-photon-number determination
Topic: Physics
Published: 9/10/2014
Authors: Zachary H Levine, Boris L. Glebov, Alan L Migdall, Thomas Gerrits, Brice R. Calkins, Adriana E Lita, Sae Woo Nam
Abstract: As part of an effort to extend fundamental single-photon measurements into the macroscopic regime, we explore how best to assign photon-number uncertainties to output waveforms of a superconducting Transition Edge Sensor (TES) and how those assignmen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916283

46. Optimization of Focused Ion Beam-Tomography for Superconducting Electronics
Topic: Physics
Published: 8/27/2014
Authors: Aric Warner Sanders, Anna E Fox, Paul David Dresselhaus, Alexandra E Curtin
Abstract: Superconducting electronics play an important role in quantum computation, ultra-low power electronics, voltage standards and magnetic sensors. Many of these applications rely on the microfabrication of superconducting circuits with multiple wiring l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915387

47. Engineering three-body interaction and Pfaffian states in circuit QED systems
Topic: Physics
Published: 8/18/2014
Authors: Mohammad Hafezi, Prabin Adhikari, Jacob M Taylor
Abstract: We demonstrate a scheme to engineer the three-body interaction in circuit-QED systems by tuning a fluxonium qubit. Connecting such qubits in a square lattice and controlling the tunneling dynamics, in the form of a synthesized magnetic field, for th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914440

48. The Half-Life of 209Po : Revisited
Topic: Physics
Published: 8/13/2014
Authors: Ronald Colle, Ryan P Fitzgerald, Lizbeth Laureano-Perez
Abstract: A substantial 25 % error in the then known and accepted (102  5) year half-life of 209Po was reported on in 2007. This error was detected from decay data from two separate primary standardizations of a 209Po solution standard, which were perf ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916048

49. Speckle phase noise in coherent laser ranging: fundamental precision limitations
Topic: Physics
Published: 8/8/2014
Authors: Esther Baumann, Jean-Daniel Deschenes, Fabrizio Raphael Giorgetta, William C Swann, Ian R Coddington, Nathan Reynolds Newbury
Abstract: Frequency-modulated continuous-wave laser detection and ranging (FMCW LADAR) measures the range to a surface through coherent detection of the backscattered light from a frequency-swept laser source. The ultimate limit to the range precision of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915862

50. Enriching 28Si beyond 99.9998 % for semiconductor quantum computing
Topic: Physics
Published: 8/5/2014
Authors: Kevin Joseph Dwyer, Joshua M Pomeroy, David S Simons, June Waiyin Lau, Kristen L. Steffens
Abstract: Using a laboratory-scale apparatus, we enrich 28Si to 40 times better than previously reported starting from natural abundance silane gas and offer another source for providing these critical materials from the industrial gas centrifuge methods. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915236



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