Now showing items 1-20 of 29

    • Adiabatic cooling of atoms by an intense standing wave 

      Chen, Jian; Story, J.G.; Tollett, J.J.; Hulet, Randall G. (1992)
      Lithium atoms channeled in the nodes of an intense standing-wave radiation field are cooled to near the recoil limit by adibatically reducing the radiation intensity. The final momentum distribution has a narrow component ...
    • Collisions of matter-wave solitons 

      Nguyen, Jason H.V.; Dyke, Paul; Luo, De; Malomed, Boris A.; Hulet, Randall G. (2014)
      Solitons are localized wave disturbances that propagate without changing shape, a result of a nonlinear interaction that compensates for wave packet dispersion. Individual solitons may collide, but a defining feature is ...
    • Comparisons of approximate bases for hydrogen in a magnetic field 

      Zimmerman, Myron L.; Hulet, Randall G.; Kleppner, Daniel (1983)
      Solutions to the diamagnetic Hamiltonian for Rydberg states of hydrogen are studied in the low-magnetic-field regime where term mixing can be ignored. Several recently proposed approximate bases are compared by calculating ...
    • Compressibility of a Fermionic Mott Insulator of Ultracold Atoms 

      Compressibility of a Fermionic Mott Insulator of Ultracold Atoms; Duarte, Pedro M.; Hart, Russell A.; Yang, Tsung-Lin; Liu, Xinxing; Paiva, Thereza; Khatami, Ehsan; Scalettar, Richard T.; Trivedi, Nandini; Hulet, Randall G. (2015)
      We characterize the Mott insulating regime of a repulsively interacting Fermi gas of ultracold atoms in a three-dimensional optical lattice. We use inᅠsitu imaging to extract the central density of the gas and to determine ...
    • Conversion of an Atomic Fermi Gas to a Long-Lived Molecular Bose Gas 

      Strecker, Kevin E.; Partridge, Guthrie B.; Hulet, Randall G. (2003)
      We have converted an ultracold Fermi gas of Li6 atoms into an ultracold gas of Li26 molecules by adiabatic passage through a Feshbach resonance. Approximately 1.5×105 molecules in the least-bound, v=38, vibrational level ...
    • Direct observation of growth and collapse of a Bose-Einstein condensate with attractive interactions 

      Gerton, Jordan M.; Strekalov, Dmitry; Prodan, Ionut; Hulet, Randall G. (2000)
      Quantum theory predicts that Bose-Einstein condensation of a spatially homogeneous gas with attractive interactions is precluded by a conventional phase transition into either a liquid or solid [1]. When confined to a trap, ...
    • Enlarging and cooling the N´eel state in an optical lattice 

      Mathy, Charles J.M.; Huse, David A.; Hulet, Randall G. (2012)
      We propose an experimental scheme to favor both the realization and the detection of the N´eel state in a two-component gas of ultracold fermions in a three-dimensional simple-cubic optical lattice. By adding three compensating ...
    • Evolution of atomic motion in an intense standing wave 

      Chen, Jian; Story, J.G.; Hulet, Randall G. (1993)
      We have investigated the effect of the dipole force and its fluctuation on the motion of Li atoms in an intense, one-dimensional, near-resonant standing light wave. The duration of the interaction of the atoms with the ...
    • Formation and propagation of matter-wave soliton trains 

      Strecker, Kevin E.; Partridge, Guthrie B.; Truscott, Andrew G.; Hulet, Randall G. (2002)
      Attraction between the atoms of a Bose-Einstein condensate renders it unstable to collapse, although a condensate with a limited number of atoms [1] can be stabilized [2] by confinement in an atom trap. However, beyond ...
    • Inhibited Spontaneous Emission by a Rydberg Atom 

      Hulet, Randall G.; Hilfer, Eric S.; Kleppner, Daniel (1985)
      Spontaneous radiation by an atom in a Rydberg state has been inhibited by use of parallel conducting planes to eliminate the vacuum modes at the transition frequency. Spontaneous emission is observed to "turn off" abruptly ...
    • Intensity Dependence of Photoassociation in a Quantum Degenerate Atomic Gas 

      Prodan, Ionut D.; Pichler, Marin; Junker, Mark; Hulet, Randall G.; Bohn, John L. (2003)
      We have measured the intensity dependent rate and frequency shift of a photoassociation transition in a quantum degenerate gas of Li7. The rate increases linearly with photoassociation laser intensity for low intensities, ...
    • Laser-cooling limits and single-ion spectroscopy 

      Wineland, D.J.; Itano, Wayne M.; Bergquist, J.C.; Hulet, Randall G. (1987)
      The limitations to the achievement of low kinetic energies for laser cooling of single ions confined in electromagnetic traps are discussed. Sideband cooling of an ion in an rf (Paul) trap is reexamined including the effects ...
    • Observation of antiferromagnetic correlations in the Hubbard model with ultracold atoms 

      Hart, Russell A.; Duarte, Pedro M.; Yang, Tsung-Lin; Liu, Xinxing; Paiva, Thereza; Khatami, Ehsan; Scalettar, Richard T.; Trivedi, Nandini; Huse, David A.; Hulet, Randall G. (2015)
      Ultracold atoms in optical lattices have great potential to contribute to a better understanding of some of the most important issues in many-body physics, such as high-temperature superconductivity [1]. The Hubbard modelラa ...
    • Observation of Quantum Jumps in a Single Atom 

      Bergquist, J.C.; Hulet, Randall G.; Itano, Wayne M.; Wineland, D.J. (1986)
      We detect the radiatively driven electric quadrupole transition to the metastable D522 state in a single, laser-cooled Hg II ion by monitoring the abrupt cessation of the fluorescence signal from the laser-excited S122→P122 ...
    • Observation of velocity-tuned multiphoton "Doppleron" resonances in laser-cooled atoms 

      Tollett, J.J.; Chen, J.; Story, J.G.; Ritchie, N.W.M.; Bradley, C.C.; Hulet, Randall G. (1990)
      An atomic beam of Li was transversely cooled using an intense standing-wave radiation field. A dramatic change in the transverse velocity distribution was observed. Structure in the resulting velocity distribution was found ...
    • Origin and Structure of the Quasi-Landau Resonances 

      Castro, Jarbas C.; Zimmerman, Myron L.; Hulet, Randall G.; Kleppner, Daniel; Freeman, Richard R. (1980)
      Highly resolved spectra are presented which show how the low-magnetic-field energy-level structure of a single-electron atom gives rise to the quasi-Landau resonances as the field is increased. Data from the strong-mixing ...
    • Pairing and Phase Separation in a Polarized Fermi Gas 

      Partridge, Guthrie B.; Li, Wenhui; Kamar, Ramsey I.; Liao, Yean-an; Hulet, Randall G. (2006)
      We report the observation of pairing in a gas of atomic fermions with unequal numbers of two components. Beyond a critical polarization, the gas separates into a phase that is consistent with a superfluid paired core ...
    • Photoassociative frequency shift in a quantum degenerate gas 

      Gerton, Jordan M.; Frew, Brian J.; Hulet, Randall G. (2001)
      A light-induced frequency shift is observed in single-photon photoassociative spectra of magnetically trapped, quantum degenerate 7Li. The shift is a manifestation of the coupling between the threshold continuum scattering ...
    • Precise Optical Spectroscopy with Ion Traps 

      Itano, Wayne M.; Bergquist, J.C.; Hulet, Randall G.; Wineland, D.J. (1988)
      We have used stored ion methods to improve resolution and sensitivity in optical spectroscopy. Single atomic ions have been confined by electric and magnetic fields, cooled by laser radiation pressure to temperatures on ...
    • Precise test of quantum jump theory 

      Hulet, Randall G.; Wineland, D.J.; Bergquist, J.C.; Itano, Wayne M. (1988)
      Quantum jumps due solely to spontaneous Raman scattering between the Zeeman sublevels of a single Mg+24 ion have been observed in the fluorescence emitted by the ion. A theory of quantum jumps for this system predicts that ...