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

Displaying records 291 to 300.
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291. Visualizing edge states with an atomic Bose gas in the quantum Hall regime
Topic: Physics
Published: 5/19/2016
Authors: Ian B Spielman, Ben Stuhl, Hsin I Lu, Lauren Moise Aycock, Dina Genkina
Abstract: We engineered a two-dimensional magnetic lattice in an elongated strip geometry, with effective per-plaquette flux $\approx4/3$ times the flux quanta. We imaged the localized edge and bulk states of atomic Bose-Einstein condensates in this strip ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=920393

292. Wake Fields in the Electron Gas, Including Transverse Response
Topic: Physics
Published: 12/1/2006
Authors: Eric J Cockayne, Zachary H Levine
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854181

293. Wavelength References for Optical Interferometry
Topic: Physics
Published: 6/12/2005
Authors: Richard W Fox, Leo W. Hollberg
Abstract: We are exploring air wavelength references useful for interferometry. Femtosecond comb frequency measurements determine mode wavelengths of a stable optical cavity in vacuum, and subsequently a tunable laser is locked to the modes in air.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=30063

294. Wavelengths, Transition Probabilities, and Energy Levels for the Spectra of Barium (Ba III through Ba LVI)
Topic: Physics
Published: 11/19/2010
Authors: Jean Ellen Sansonetti, John J Curry
Abstract: Energy levels, with designations and uncertainties, have been compiled for the spectra of barium (Z=56) ions from doubly-ionized to hydrogen-like. Wavelengths with classifications, intensities, and transition probabilities are also tabulated. In addi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904125

295. 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

296. Weight Functions for Biases in Atomic Frequency Standards
Topic: Physics
Published: 10/5/2008
Author: Jon Hardy Shirley
Abstract: We present a unified treatment of frequency-standard biases that vary significantly during the time of measurement. We introduce three time-dependent weight functions built from the solution of the unperturbed equations of motion for a two-level sys ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900983

297. Weight Functions for Biases in Atomic Frequency Standards
Topic: Physics
Published: 3/1/2010
Author: Jon Hardy Shirley
Abstract: Many perturbations that affect atomic frequency standards vary during the period of measurement. To include this time variation, we introduce three time-dependent weight functions built from the solution of the unperturbed equations of motion of a t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902850

298. When does a branched polymer becomes a particle?
Topic: Physics
Published: 9/17/2015
Authors: Alexandros Chremos, Jack F Douglas
Abstract: Melts with topologically distinct molecular structures are investigated by molecular dynamics simulation. We determine the mean polymer size and shape, and glass transition temperature for each molecular topology. Both in terms of structure and dynam ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918746

299. Yb Optical Lattice Clock
Topic: Physics
Published: 11/23/2008
Authors: Nathan D. Lemke, Andrew D Ludlow, Zeb Barber, N Poli, C.W. Hoyt, Long-Sheng Ma, Jason Stalnaker, Christopher W Oates, Leo Hollberg, James C Bergquist, A. Brusch, Tara Michele Fortier, Scott A Diddams, Thomas Patrick Heavner, Steven R Jefferts, Thomas Edward Parker
Abstract: We describe the development and latest results of an optical lattice clock based on neutral Yb atoms, including investigations based on both even and odd isotopes. We report a fractional frequency uncertainty below 10^u-15^ for ^u171^Yb.
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901008

300. Zero-energy modes and gate-tunable gap in graphene on hexagonal boron nitride
Topic: Physics
Published: 9/13/2012
Authors: Markus Kindermann, Bruno Uchoa, David L. Miller
Abstract: In this article, we derive an effective theory of graphene on a hexagonal boron nitride (h-BN) substrate. We show that the h-BN substrate generically opens a spectral gap in graphene despite the lattice mismatch. The origin of that gap is particularl ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911095



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