Postdoc Yu-Ju Lin employed!
Yu-Ju Lin who has spent the past three years working on the artificial gauge fields project will be moving on to a permanent position at the Academia Sinica, Taiwan in November. We will miss you, and good luck!
Category: Group News
Phases of a Two-Dimensional Bose Gas in an Optical Lattice
Karina’s paper [Phys. Rev. Lett. 105, 110401 (2010)] featuring a fantastic measurement of the SF/MI phase transition in a 2D Bose-Hubbard system has been published in PRL. Our result is in agreement with QMC calculations with no adjustable parameters. This work …
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Synthetic magnetic fields for ultracold neutral atoms
Ultracold atoms are an excellent system to realize important models in condensed matter physics, owing to its nearly disorder-free and tunable properties. One of the most intriguing topics is the quantum-Hall physics of 2D electronic systems in a strong magnetic …
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Quantum and classical dynamics of a Bose-Einstein condensate in a large-period optical lattice
We experimentally investigate diffraction of a 87Rb Bose-Einstein condensate from a one-dimensional optical lattice. We use a range of lattice periods and timescales, including those beyond the Raman-Nath limit. We compare the results to numerical solutions of the Gross-Pitaevskii equation …
Postdoc Rob Compton employed!
Rob Compton, working on the Feshbach resonance project on Rubidum II, lands permanent employment. He will be working for Honeywell in Minneapolis, MN!
Rapid production of 87Rb Bose-Einstein condensates in a combined magnetic and optical potential
We describe an apparatus for quickly and simply producing 87Rb Bose-Einstein condensates. It is based on a magnetic quadrupole trap and a red-detuned optical dipole trap. We collect atoms in a magneto-optical trap (MOT) and then capture the atoms in …
Raman processes and effective gauge potentials
A technique is described by which light-induced gauge potentials allow systems of ultracold neutral atoms to behave like charged particles in a magnetic field. Here, atoms move in a uniform laser field with a spatially varying Zeeman shift and experience …
Bose-Einstein Condensate in a Uniform Light-Induced Vector Potential
We use a two-photon dressing field to create an effective vector gauge potential for Bose-Einstein-condensed 87Rb atoms in the F=1 hyperfine ground state. These Raman-dressed states are spin and momentum superpositions, and we adiabatically load the atoms into the lowest …
Bose-Einstein Condensate in a Uniform Light-Induced Vector Potential Read more »
Condensate Fraction in a 2D Bose Gas Measured across the Mott-Insulator Transition
We realize a single-band 2D Bose-Hubbard system with Rb atoms in an optical lattice and measure the condensate fraction as a function of lattice depth, crossing from the superfluid to the Mott-insulating phase. We quantitatively identify the location of the …
Condensate Fraction in a 2D Bose Gas Measured across the Mott-Insulator Transition Read more »