Trapping ultracold dysprosium: a highly magnetic gas for dipolar physics.

Ultracold dysprosium gases, with a magnetic moment 10 times that of alkali atoms and equal only to terbium as the most magnetic atom, are expected to exhibit a multitude of fascinating collisional dynamics and quantum dipolar phases, including quantum liquid crystal physics. We report the first laser cooling and trapping of half a billion Dy atoms using a repumper-free magneto-optical trap (MOT) and continuously loaded magnetic confinement, and we characterize the trap recycling dynamics for bosonic and fermionic isotopes. The first inelastic collision measurements in the few partial wave, 100 microK-1 mK, regime are made in a system possessing a submerged open electronic f shell. In addition, we observe unusual stripes of intra-MOT <10 microK sub-Doppler cooled atoms.

[1]  W. Ketterle,et al.  Large spin relaxation rates in trapped submerged-shell atoms , 2009, 0909.0249.

[2]  Benjamin M. Fregoso,et al.  Ferronematic ground state of the dilute dipolar Fermi gas. , 2009, Physical review letters.

[3]  Dmitry Budker,et al.  Measurement of hyperfine structure and isotope shifts in the Dy 421 nm transition. , 2009, Optics letters.

[4]  Benjamin M. Fregoso,et al.  Biaxial nematic phases in ultracold dipolar Fermi gases , 2009, 0902.0739.

[5]  J. Ye,et al.  Ultracold polar molecules near quantum degeneracy. , 2008, Faraday discussions.

[6]  J. Betouras,et al.  Metanematic, smectic, and crystalline phases of dipolar fermions in an optical lattice , 2008, 0803.2708.

[7]  M. Saffman,et al.  Scaling the neutral-atom Rydberg gate quantum computer by collective encoding in holmium atoms , 2008, 0805.0440.

[8]  A. Berglund,et al.  Narrow-line magneto-optical cooling and trapping of strongly magnetic atoms. , 2008, Physical review letters.

[9]  H. Pu,et al.  Phase-space deformation of a trapped dipolar Fermi gas , 2007, 0710.5223.

[10]  J. Dalibard,et al.  Many-Body Physics with Ultracold Gases , 2007, 0704.3011.

[11]  A. Berglund,et al.  Sub-Doppler laser cooling and magnetic trapping of erbium , 2007, 0802.0836.

[12]  T. Lahaye,et al.  Strong dipolar effects in a quantum ferrofluid , 2007, Nature.

[13]  C. P. Sun,et al.  Novel quantum phases of dipolar bose gases in optical lattices. , 2006, Physical review letters.

[14]  D. Stamper-Kurn,et al.  Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose–Einstein condensate , 2006, Nature.

[15]  J. McClelland,et al.  Laser cooling without repumping: a magneto-optical trap for erbium atoms. , 2006, Physical review letters.

[16]  A. Derevianko,et al.  Quantum computing with magnetically interacting atoms , 2004, quant-ph/0406117.

[17]  W. Jhe,et al.  Direct observation of the sub-Doppler trap in a parametrically driven magneto-optical trap , 2004 .

[18]  P. Schmidt,et al.  Dipolar relaxation in an ultra-cold gas of magnetically trapped chromium atoms , 2003, quant-ph/0307184.

[19]  S. Stenholm,et al.  Laser cooling and trapping , 1988 .