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Displaying 2876 - 2900 of 3362

A Discussion on the Interpretation and Characterization of Metafilms/Metasurfaces: The Two-Dimensional Equivalent of Metamaterials

October 1, 2009
Author(s)
Christopher L. Holloway, Andrew M. Dienstfrey, Edward E. Kuester, John F. O'Hara, Abul K. Azad
A metafilm is the surface equivalent of a metamaterial. More precisely, a metafilm is a surface distribution of suitably chosen electrically small scatterers. Metafilms are becoming popular as an alternative to the full three-dimensional metamaterials

Prospects for mixed-isotope Bose-Einstein condensates in rubidium

October 16, 2008
Author(s)
J P. Burke, J L. Bohn, B D. Esry, C H. Greene
We present quantiative calculations of binary collision parameters for mixtures of ultracold gases of 85Rb and 87Rb atoms. The elastic cross section for pure 85Rb collisions is found to be unusually small in the important temperature range T=0.1-1mK for

Sub-Wavelength Resonators: On the use of Metafilms to Overcome the l/2 size limit

March 1, 2008
Author(s)
Christopher L. Holloway, Derik Love, Edward E. Kuester, Alesandro Salandrino, Nader Engheta
Metamaterials, in particular, double negative materials, have been used in the design of electromagnetic resonators as a means to overcome the classical $\lambda/2$ requirement. The surface equivalent of a metamaterial is a so-called metafilm, and is

Demonstration of a Multiplexer of Dissipationless SQUIDs}

January 18, 2008
Author(s)
John Mates, Gene C. Hilton, Kent D. Irwin, Leila R. Vale, Konrad Lehnert
We report on the development of a microwave SQUID multiplexer for reading out arrays of low-temperature detectors. In this frequency-division multiplexer, each SQUID couples to a high-Q superconducting resonator so that flux through the SQUID shifts the

Chip-Scale Atomic Devices

June 4, 2006
Author(s)
John E. Kitching, Svenja A. Knappe, P Schwindt, Ying-ju Wang, Hugh Robinson, Leo W. Hollberg, Li-Anne Liew, John Moreland, Alan Brannon, J Breitbarth, Brad Lindseth, Z Popovic, V Shah, Vladislav Gerginov, Matt Eardley
We present an overview of recent work to develop chip-scale atomic devices such as frequency references and magnetometers. These devices take advantage of advances over the last ten years in the fields of micro electro mechanical systems (MEMS), precision

Laser Cooling Without Repumping: A Magneto-Optical Trap for Erbium Atoms

April 14, 2006
Author(s)
Jabez J. McClelland, James L. Hanssen
We report on a novel mechanism that allows for laser cooling of atoms that do not have a closed cycling transition. This mechanism is observed in a magneto-optical trap for erbium, an atom with a very complex energy level structure with multiple pathways

Single-Stage Sub-Doppler Cooling of Alkaline Earth Atoms

May 1, 2003
Author(s)
X Xu, T Loftus, J W. Dunn, C H. Greene, John L. Hall, Alan Gallagher, Jun Ye
We report the first experimental study of sub-Doppler cooling in alkaline earth atoms ( 87Sr) enabled by the presence of nuclear spin-oriented magnetic gedeneracy in the atomic ground state. Sub-Doppler cooling in a ς +-ς - configuration is achieved

CCEM-K2 Key Comparison of 10 Mohm and 1 Gohm Resistance Standards

April 1, 2003
Author(s)
Dean G. Jarrett, Ronald F. Dziuba
An international comparison of dc resistance at 10 Mohm and 1 Gohm was organized under the auspices of the Consultative Committee for Electricity and Magnetism (CCEM) and piloted by the National Institute of Standards and Technology (NIST) with 14 other

Flat-Phase Loading of a Bose-Einstein Condensate into an Optical Lattice

November 1, 2002
Author(s)
S E. Sklarz, I Friedler, D J. Tannor, Y B. Band, Carl J. Williams
It has been proposed that the adiabatic loading of a Bose-Einstein Condensate into an optical lattice via the Mott-Insulator transition can be used to initialize a quantum computer [D.Jaksch, et al., Phys. Rev. Lett. 81, 3108 (1998)]. The loading of a Bose

A Facility for Nanoscience Research: An Overview

July 1, 2002
Author(s)
Joseph A. Stroscio, E Hudson, Steven R. Blankenship, Robert Celotta, Aaron P. Fein
We describe the development of an experimental system, consisting of a low temperature scanning tunneling microscope coupled to UHV tip and sample preparation chambers, with the goal of providing new measurement capabilities for the study of quantum and

Spin-Glass and Random-Field Effects in Exchanged-Biased NiFe Film on a NiO Single-Crystal Substrate

May 1, 2002
Author(s)
A E P de Araujo, F L. Machado, A R. Rodrigues, A Azevedo, F M. de Aguiar, J R. de Almeida, S M. Rezende, William F. Egelhoff Jr.
SQUID magnetometry measurements on a ferromagnetic/antiferromagnetic sample made of a permalloy thin film sputtered on a thick NiO single-crystal substratre reveal remarkable irreversibilities in the magnetization (M) versus temperature (T) data. The field

Users' Guide to the NIST-High-Voltage Capacitance Ratio Bridge

March 28, 2001
Author(s)
Eric D. Simmon, Gerald FitzPatrick, O. Petersons
This TechNote has been written as a guide to the operation of and applications for the NIST Capacitor Ratio Bridge (CRB). The theory, design, and operating principles of the CRB, sources of measurement error, and principal applications are discussed in

Cluster Primary Ion Beam Secondary Ion Mass Spectrometry for Semiconductor Characterization

January 1, 2001
Author(s)
John G. Gillen, S V. Roberson, Albert J. Fahey, Marlon L. Walker, J Bennett, R Lareau
We are evaluating the use of polyatomic and cluster primary ion beams for characterization of semiconductor materials by secondary ion mass spectrometry using both magnetic sector and time-of-flight SIMS instruments. Primary ion beams of SF 5+, C 8- and

Exchange Bias Relaxation in CoO-Biased Films

January 1, 1999
Author(s)
Robert McMichael, C Lee, Mark D. Stiles, F Serpa, P J. Chen, William F. Egelhoff Jr.
Because the memory of the bias direction is carried by the antiferromagnetic order in exchange biased films, the stability of the antiferromagnetic order is critical to the existence of the exchange bias field. Ferromagnetic resonance was used to measure

Experimental Investigation of the Initial-State Alignment Dependence in the Energy Pooling Process: Ca(4s4p 3 P 1 )+Ca(4s4p 3 P 1 )--> Ca(4s4p 1 P 1 )+Ca(4s 2 )

September 1, 1998
Author(s)
Harold V. Parks, E M. Spain, J E. Smedley, S R. Leone
A pulsed laser investigation is performed to study the detailed efforts of electronic angular momentum alignment on the cross section for the energy transfer process: Ca(4s4p 3P 1)+Ca(4s4p 3P 1)>Ca(4s4p 1P 1)+Ca(4s 2). A uniform magnetic field imposed by a

A Variational Approach to Exchange Energy Calculations in Micromagnetics

June 1, 1998
Author(s)
Michael J. Donahue
This paper presents a magnetization interpolation method for micromagnetic exchange energy calculations using a variational procedure to relax spins on a supplemental (refined) lattice. The approximations implicit in standard micromagnetic discretization
Displaying 2876 - 2900 of 3362
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