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

Displaying records 41 to 50 of 302 records.
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41. Extended and Revised Analysis of Singly Ionized Tin: Sn II
Topic: Physics
Published: 10/28/2014
Authors: K. Haris, Alexander Kramida, A. Tauheed
Abstract: The electronic structure of singly ionized tin (Sn II) is partly a one-electron and partly a three-electron system with ground configuration 5s25p. The excited configurations are of the type 5s2nℓ in the one-electron part, and 5s5p2, 5p3 and 5s ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915078

42. 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

43. 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

44. 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

45. 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

46. 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

47. 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

48. 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

49. 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

50. 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



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