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You searched on: Topic Area: Atomic Physics

Displaying records 31 to 40 of 85 records.
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31. 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 ...

32. Radiofrequency dressing of multiple Feshbach resonances
Topic: Atomic Physics
Published: 11/3/2009
Authors: A M Kaufman, R P Anderson, Thomas Mark Hanna, Eite Tiesinga, Paul S Julienne, D S Hall
Abstract: We demonstrate and explain the coupling of several proximate Feshbach resonances in $^{87}$Rb using radiofrequency (rf) radiation. We present accurate measurements of the resonances and observe the changes in the scattering properties that arise thro ...

33. Uncooled, Millimeter-Scale Atomic Magnetometers with Femtotesla Sensitivity
Topic: Atomic Physics
Published: 10/26/2009
Authors: John E Kitching, Svenja A Knappe, William C. Griffith, Jan Preusser, V Gerginov, Peter D. Schwindt, Vishal Shah, Ricardo Jimenez Martinez
Abstract: We summarize recent results at NIST to develop high-performance yet highly miniaturized magnetic sensors based on atomic vapors confined in microfabricated alkali vapor cells. These sensors currently achieve sensitivities in the range of a few tens o ...

34. Effective three-body interactions and decoherence of coherent atom states in optical lattices
Topic: Atomic Physics
Published: 9/15/2009
Authors: Philip Johnson, Eite Tiesinga, James V Porto, Carl J Williams
Abstract: We show that virtual excitations of neutral bosons to higher vibrational states in a three dimensional optical lattice generate effective, tunable, attractive three-body interactions. These effective processes can quickly decohere coherent states hel ...

35. Collisional cooling of ultra-cold atom ensembles using Feshbach resonances
Topic: Atomic Physics
Published: 9/8/2009
Authors: Ludwig G. Mathey, Eite Tiesinga, Paul S Julienne, Charles W Clark
Abstract: We propose a new type of cooling mechanism for ultra-cold fermionic atom ensembles, which capitalizes on the energy dependence of inelastic collisions in the presence of a Feshbach resonance. We first discuss the case of a single magnetic reson ...

36. Lattice Interferometer for Ultra-Cold Atoms
Topic: Atomic Physics
Published: 8/11/2009
Authors: Mikkel Andersen, Tycho Sleator
Abstract: We demonstrate an atomic interferometer based on ultra-cold atoms released from an optical lattice. This technique yields a large improvement in signal to noise over a related interferometer previously demonstrated. The interferometer involves diff ...

37. Multi-channel modeling of the formation of vibrationally cold polar KRb molecules.
Topic: Atomic Physics
Published: 5/14/2009
Authors: Svetlana Kotochigova, Eite Tiesinga, Paul S Julienne
Abstract: We describe the theoretical advances that influenced the experimental creation of vibrationally and translationally cold polar 40K87Rb molecules [Nature Phys. 4, 622 (2008), Science 322, 231 (2008)]. Cold molecules were created from very-weakly boun ...

38. Rotation induced superfluid-normal phase separation in trapped Fermi gases
Topic: Atomic Physics
Published: 5/13/2009
Authors: Menderes Iskin, Eite Tiesinga
Abstract: We use the Bogoliubov-de Gennes formalism to analyze the effects of adiabatic rotation on the ground state phases of harmonically trapped Fermi gases. We find that the rotation breaks Cooper pairs that are located near the trap edge, and that this le ...

39. Prediction of Feshbach resonances from three input parameters
Topic: Atomic Physics
Published: 4/30/2009
Authors: Thomas Mark Hanna, Eite Tiesinga, Paul S Julienne
Abstract: We have developed a model of Feshbach resonances in gases of ultracold alkali metal atoms using the ideas of quantum defect theory. Our model requires just three parameters - the singlet and triplet scattering lengths, and the coefficient of the long ...

40. Optical detection of NMR ^dJ^{math minus}spectra at zero magnetic field
Topic: Atomic Physics
Published: 3/28/2009
Authors: M Ledbetter, C.W. Crawford, A Pines, D.E. Wemmer, Svenja A Knappe, John E Kitching, D Budker
Abstract: Nuclear magnetic resonance (NMR) has emerged as one of the most powerful analytical tools for elucidating molecular structure. One of the parameters typically extracted from NMR spectra which is necessary to fully understand the structure of a molec ...

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