Magnetic trap
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Submillikelvin Dipolar Molecules in a Radio-Frequency Magneto-Optical Trap Open
We demonstrate a scheme for magneto-optically trapping strontium monofluoride (SrF) molecules at temperatures one order of magnitude lower and phase space densities 3 orders of magnitude higher than obtained previously with laser-cooled mo…
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Measurement of the neutron lifetime using a magneto-gravitational trap and in situ detection Open
How long does a neutron live? Unlike the proton, whose lifetime is longer than the age of the universe, a free neutron decays with a lifetime of about 15 minutes. Measuring the exact lifetime of neutrons is surprisingly tricky; putting the…
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Magnetic Trapping and Coherent Control of Laser-Cooled Molecules Open
We demonstrate coherent microwave control of the rotational, hyperfine, and Zeeman states of ultracold CaF molecules, and the magnetic trapping of these molecules in a single, selectable quantum state. We trap about 5×10^{3} molecules for …
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Direct Laser Cooling to Bose-Einstein Condensation in a Dipole Trap Open
We present a method for producing three-dimensional Bose-Einstein condensates using only laser cooling. The phase transition to condensation is crossed with 2.5×10^{4} ^{87}Rb atoms at a temperature of T_{c}=0.6 μK after 1.4 s of cooling. …
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Improved magneto–optical trapping of a diatomic molecule Open
We present experimental results from a new scheme for magneto–optically trapping strontium monofluoride (SrF) molecules, which provides increased confinement compared to our original work. The improved trap employs a new approach to magnet…
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Observation of Magnetic Solitons in Two-Component Bose-Einstein Condensates Open
We experimentally investigate the dynamics of spin solitary waves (magnetic solitons) in a harmonically trapped, binary superfluid mixture. We measure the in situ density of each pseudospin component and their relative local phase via an i…
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Resolved-Sideband Laser Cooling in a Penning Trap Open
We report the laser cooling of a single ^{40}Ca^{+} ion in a Penning trap to the motional ground state in one dimension. Cooling is performed in the strong binding limit on the 729-nm electric quadrupole S_{1/2}↔D_{5/2} transition, broaden…
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Magnetic Trapping of Cold Methyl Radicals Open
We have demonstrated that a supersonic beam of methyl radicals (CH_{3}) in the ground rotational state of both para and ortho species has been slowed down to standstill with a magnetic molecular decelerator, and successfully captured spati…
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Collisions between Ultracold Molecules and Atoms in a Magnetic Trap Open
We prepare mixtures of ultracold CaF molecules and Rb atoms in a magnetic trap and study their inelastic collisions. When the atoms are prepared in the spin-stretched state and the molecules in the spin-stretched component of the first rot…
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Trapping of Molecular Oxygen together with Lithium Atoms Open
We demonstrate simultaneous deceleration and trapping of a cold atomic and molecular mixture. This is the first step towards studies of cold atom-molecule collisions at low temperatures as well as application of sympathetic cooling. Both a…
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Two-species five-beam magneto-optical trap for erbium and dysprosium Open
We report on the first realization of a two-species magneto-optical trap\n(MOT) for erbium and dysprosium. The MOT operates on an intercombination line\nfor the respective species. Owing to the narrow-line character of such a\ncooling tran…
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Long Rotational Coherence Times of Molecules in a Magnetic Trap Open
Polar molecules in superpositions of rotational states exhibit long-range dipolar interactions, but maintaining their coherence in a trapped sample is a challenge. We present calculations that show many laser-coolable molecules have conven…
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Simultaneous confinement of low-energy electrons and positrons in a compact magnetic mirror trap Open
More than 10 ^7 electrons and 10 ^5 positrons with energy less than a few eV were confined simultaneously for the first time in a compact magnetic mirror trap with plugging potentials. The exponential decay time constant of the confined po…
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Quasi-discrete particle motion in an externally imposed, ordered structure in a dusty plasma at high magnetic field Open
Dusty plasmas have been studied in argon, radio frequency (rf) glow discharge plasmas at magnetic fields up to 2.5 T where the electrons and ions are strongly magnetized. Plasmas are generated between two parallel plate electrodes where th…
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A permanent magnetic film atom chip for Bose-Einstein condensation Open
We present a hybrid atom chip which combines a permanent magnetic film with a micromachined current-carrying structure used to realize a Bose-Einstein condensate (BEC). A novel TbGdFeCo material with large perpendicular magnetization has b…
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Fictitious magnetic-field gradients in optical microtraps as an experimental tool for interrogating and manipulating cold atoms Open
Optical microtraps provide a strong spatial confinement for laser-cooled atoms. They can, e.g., be realized with strongly focused trapping light beams or the optical near fields of nano-scale waveguides and photonic nanostructures. Atoms i…
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Controlling spin flips of molecules in an electromagnetic trap Open
Doubly dipolar molecules exhibit complex internal spin-dynamics when electric and magnetic fields are both applied. Near magnetic trap minima, these spin-dynamics lead to enhancements in Majorana spin-flip transitions by many orders of mag…
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Efficient production of a narrow-line erbium magneto-optical trap with two-stage slowing Open
We describe an experimental setup for producing a large cold erbium (Er) sample in a narrow-line magneto-optical trap (MOT) in a simple and efficient way. We implement a pair of angled slowing beams with respect to the Zeeman slower axis, …
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Sensitivity of Ultracold Atoms to Quantized Flux in a Superconducting Ring Open
We report on the magnetic trapping of an ultracold ensemble of (87)Rb atoms close to a superconducting ring prepared in different states of quantized magnetic flux. The niobium ring of 10 μm radius is prepared in a flux state n Φ(0), where…
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Measuring the disorder of vortex lattices in a Bose-Einstein condensate Open
We report observations of the formation and subsequent decay of a vortex lattice in a Bose-Einstein condensate confined in a hybrid optical-magnetic trap. Vortices are induced by rotating the anharmonic magnetic potential that provides con…
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The Flexible Plasma Trap (FPT) for the production of overdense plasmas Open
Electron Cyclotron Resonance Ion Sources are currently the most efficient ion sources among those used in facilities dedicated to nuclear physics. The need for a more flexible magnetic field and RF injection system suggested to design and …
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Simultaneous deceleration of atoms and molecules in a supersonic beam Open
A unique property of Zeeman effect based manipulation of paramagnetic particle’s motion is the ability to control velocities of both atoms and molecules. In particular the moving magnetic trap decelerator is capable of slowing and eventual…
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Hybrid evaporative cooling of <sup>133</sup>Cs atoms to Bose-Einstein condensation Open
The Bose-Einstein condensation (BEC) of 133 Cs atoms offers an appealing platform for studying the many-body physics of interacting Bose quantum gases, owing to the rich Feshbach resonances that can be readily achieved in the low magnetic …
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Two-stage crossed beam cooling with ^6Li and ^133Cs atoms in microgravity Open
Applying the direct simulation Monte Carlo (DSMC) method developed for ultracold Bose-Fermi mixture gases research, we study the sympathetic cooling process of 6Li and 133Cs atoms in a crossed optical dipole trap. The obstacles to producin…
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Observation of Poincaré-Andronov-Hopf Bifurcation in Cyclotron Maser Emission from a Magnetic Plasma Trap Open
We report the first experimental evidence of a controlled transition from the generation of periodic bursts of electromagnetic radiation into the continuous-wave regime of a cyclotron maser formed in magnetically confined nonequilibrium pl…
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The one-dimensional camelback potential in the parallel dipole line trap: Stability conditions and finite size effect Open
We recently demonstrated a magnetic parallel dipole line (PDL) system that serves as a unique diamagnetic trap with a fascinating one-dimensional camelback potential along its longitudinal axis. The system can be realized with a pair of tr…
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Production of large Bose-Einstein condensates in a magnetic-shield-compatible hybrid trap Open
We describe the production of large ${}^{23} \\mathrm{Na}$ Bose-Einstein\ncondensates in a hybrid trap characterized by a weak magnetic field quadrupole\nand a tightly focused infrared beam. The use of small magnetic field gradients\nmakes…
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Low-energy collisions between carbon atoms and oxygen molecules in a magnetic trap Open
Trapping of atoms and molecules in electrostatic, magnetic and optical traps has enabled studying atomic and molecular interactions on a timescale of many seconds, allowing observations of ultra-cold collisions and reactions. Here we repor…
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Long-term trapping of Stark-decelerated molecules Open
Trapped cold molecules represent attractive systems for precision-spectroscopic studies and for investigations of cold collisions and chemical reactions. However, achieving their confinement for sufficiently long timescales remains a chall…
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Trapping ultracold atoms in a sub-micron-period triangular magnetic lattice Open
We report the trapping of ultracold 87Rb atoms in a 0.7-μm-period two-dimensional triangular magnetic lattice on an atom chip. The magnetic lattice is created by a lithographically patterned magnetic Co/Pd multilayer film plus bias fields.…