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Search Publications by: Eite Tiesinga (Fed)

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Displaying 126 - 150 of 373

Radiofrequency dressing of multiple Feshbach resonances

November 3, 2009
Author(s)
A M. Kaufman, R P. Anderson, Thomas Hanna, Eite Tiesinga, Paul S. Julienne, D S. Hall
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 through the

Radiofrequency dressing of multiple Feshbach resonances

November 3, 2009
Author(s)
A M. Kaufman, R P. Anderson, Thomas Hanna, Eite Tiesinga, Paul S. Julienne, D S. Hall
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 through the

Effective three-body interactions of neutral atoms in optical lattices

September 15, 2009
Author(s)
Philip Johnson, Eite Tiesinga, James V. Porto, Carl J. Williams
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 held in

Collisional cooling of ultra-cold atom ensembles using Feshbach resonances

September 8, 2009
Author(s)
Ludwig G. Mathey, Eite Tiesinga, Paul S. Julienne, Charles W. Clark
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 resonance, and

Counterflow and paired superfluidity in one-dimensional Bose mixtures in optical lattices

August 24, 2009
Author(s)
Anzi A. Hu, Ludwig G. Mathey, Ippei Danshita, Eite Tiesinga, Carl J. Williams, Charles W. Clark
We study the quantum phases of mixtures of ultra-cold bosonic atoms held in an optical lattice that confines motion or hopping to one spatial dimension. The phases are found by using Tomonaga-Luttinger liquid theory as well as the numerical method of time

Number Fluctuations and Energy Dissipation in Sodium Spinor Condensates

June 5, 2009
Author(s)
Yingmei Liu, Eduardo N. Gomez, Stephen E. Maxwell, Lincoln D. Turner, Eite Tiesinga, Paul D. Lett
We characterize fluctuations in atom number and spin populations in F = 1 sodium spinor condensates. The time evolution of the population fluctuations shows a maximum. We interpret this as evidence of a dissipation-driven separatrix crossing in phase space

Multi-channel modeling of the formation of vibrationally cold polar KRb molecules.

May 14, 2009
Author(s)
Svetlana Kotochigova, Eite Tiesinga, Paul S. Julienne
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 bound

Rotation induced superfluid-normal phase separation in trapped Fermi gases

May 13, 2009
Author(s)
Menderes Iskin, Eite Tiesinga
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 leads to

Prediction of Feshbach resonances from three input parameters

April 30, 2009
Author(s)
Thomas M. Hanna, Eite Tiesinga, Paul S. Julienne
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 range

Avoided crossings between bound states of ultracold Cesium dimers

November 5, 2008
Author(s)
Jeremy M. Hutson, Eite Tiesinga, Paul S. Julienne
We present a new computational method for calculating bound states of ultracold alkali metal dimers in the presence of magnetic fields. The new method is based on propagation of coupled differential equations and does not use a basis set for the

Multi-level effects in the Rabi oscillations of a Josephson phase qubit

September 15, 2008
Author(s)
S. K. Dutta, H. Paik, T. A. Palomaki, J. R. Anderson, A. J. Dragt, C. J. Lobb, F. C. Wellstood, Frederick Strauch, Kaushik Mitra, Eite Tiesinga
We present Rabi oscillation measurements of an Nb/AlOx/Nb dc SQUID phase qubit with a 100 ¿m2 area junction acquired at 25 mK over a range of microwave power and frequency detuning. Given the slightly anharmonic level structure of the qubit, several

Two-Body Transients in Coupled Atomic-Molecular BECs

March 3, 2008
Author(s)
Pascal Naidon, Eite Tiesinga, Paul S. Julienne
We discuss the dynamics of an atomic Bose-Einstein condensate when pairs of atoms are converted into molecules by single-color photoassociation. Three main regimes are found and it is shown that they can be understood on the basis oftime-dependent two-body