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Displaying records 11 to 20 of 22 records.
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11. Observation of a superfluid Hall effect
Topic: Atomic Physics
Published: 7/3/2012
Authors: Lindsay J. LeBlanc, Karina K. Jimenez Garcia, Ross A. Williams, Matthew C. Beeler, Abigail Reiko Perry, William D Phillips, Ian B Spielman
Abstract: Measurement techniques based upon the Hall effect are essential tools in condensed matter physics. Here, we report the first observation of a Hall effect in an ultracold gas of neutral atoms, revealed by measuring Bose-Einstein condensate's transpo ...

12. Observation of the red-blue detuning asymmetry in matter-wave superradiance
Topic: Atomic Physics
Published: 11/23/2010
Authors: Lu Deng, Edward W Hagley, Qiang Cao, Xiaorui Wang, Xinyu Luo, Ruquan Wang, Fan Yang, Xiaoji Zhou, Xuzong Chen, M. G. Payne, Mingsheng Zhan
Abstract: We show the first experimental observations of matter-wave superradiance using blue-detuned light, and demonstrate a pump-laser detuning asymmetry in the collective atomic recoil motion. In contrast to all previous theoretical treatments, which p ...

13. Phases of a 2D Bose Gas in an Optical Lattice
Topic: Atomic Physics
Published: 9/9/2010
Authors: Karina K. Jimenez Garcia, Yu-Ju Lin, James V Porto, Ian B Spielman
Abstract: Ultra-cold atoms in optical lattices realize essential models in condensed matter physics. Like with most experiments with ultra-cold atoms, our Rubidium-87 Bose Einstein condensate is confined in a harmonic trapping potential that persists even ...

14. Progress at NIST in measuring the D-lines of Li isotopes using an optical frequency comb
Topic: Atomic Physics
Published: 12/20/2010
Authors: Clayton Simien, Samuel Middleton Brewer, Joseph N Tan, John D Gillaspy, Craig J Sansonetti
Abstract: Precise spectroscopic experiments with light atoms can provide information about nuclear properties that are very difficult to obtain in electron scattering experiments. For example, relative nuclear radii of low-Z isotopes can be determined accurat ...

15. Quasi-phasematched Second Harmonic Generation in GaAs Microdisks
Topic: Atomic Physics
Published: 11/15/2009
Authors: Paulina S Kuo, W Fang, Glenn Scott Solomon
Abstract: We discuss design and tuning of second-harmonic generation in GaAs microdisks. Quasi-phasematching can be achieved in the microdisk geometry without external domain inversions, but efficient nonlinear optical mixing requires that all waves be resonan ...

16. Ratio of the Al^u+^ and Hg^u+^ Optical Clock Frequencies to 17 Decimal Places
Topic: Atomic Physics
Published: 8/25/2008
Authors: Wayne M Itano, Till P Rosenband, David Hume, P.O. Schmidt, Chin W. Chou, A. Brusch, Luca Lorini, Windell Oskay, Robert Eugene Drullinger, Sarah Bickman, Tara Michele Fortier, Jason Stalnaker, Scott A Diddams, William C Swann, Nathan Reynolds Newbury, David J Wineland, James C Bergquist
Abstract: Frequency standards (atomic clocks) based on narrow optical transitions in ^u27^Al^u+^ and ^u199^Hg^u+^ have been developed over the past several years at NIST. These two types of standards are both based on single ions confined in Paul traps, but di ...

17. Realization of a single and closed Lambda-system in a room-temperature three-level coherently prepared resonant medium with narrow D 1 hyperfine splittings
Topic: Atomic Physics
Published: 7/9/2009
Authors: Ke Li, Lu Deng, M G Payne
Abstract: A single, closed three-state Ë-system using a parallel-polarization, co-propagating beam configuration in rubidium is investigated experimentally for efficient group velocity reduction at room temperature using electromagnetically induced transp ...

18. Spectrum and Energy Levels of Five-Times Ionized Zirconium (Zr VI)
Topic: Atomic Physics
Published: 1/5/2016
Authors: Joseph Reader, Mark D. Lindsay
Abstract: The spectrum of five-times-ionized zirconium Zr VI was observed from 160 Å to 2000 Å with sliding spark discharges on 10.7-m normal- and grazing-incidence spectrographs. The existing analysis of this spectrum [Khan Z. A. et al. 1985 Phys. Scr. 31 83 ...

19. Stimulated Generation of Superluminal Light Pulses via Four-wave Mixing
Topic: Atomic Physics
Published: 4/26/2012
Authors: Ryan Thomas Glasser, Ulrich Vogl, Paul D Lett
Abstract: We report on the four-wave mixing of superluminal pulses, in which both the injected and generated pulses involved in the process propagate with negative group velocities. Generated pulses with negative group velocities of up to vg = −c/880 ar ...

20. Trapping atoms using nanoscale quantum vacuum forces
Topic: Atomic Physics
Published: 7/10/2014
Authors: Jacob M Taylor, Darrick E. Chang, Kanupriya Sinha, H J Kimble
Abstract: Quantum vacuum forces dictate the interaction between individual atoms and dielectric surfaces at nanoscale distances. For example, their large strengths typically overwhelm externally applied forces, which makes it challenging to controllably interf ...

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