Formation of a Matter-Wave Bright Soliton

We report the production of matter-wave solitons in an ultracold lithium-7 gas. The effective interaction between atoms in a Bose-Einstein condensate is tuned with a Feshbach resonance from repulsive to attractive before release in a one-dimensional optical waveguide. Propagation of the soliton without dispersion over a macroscopic distance of 1.1 millimeter is observed. A simple theoretical model explains the stability region of the soliton. These matter-wave solitons open possibilities for future applications in coherent atom optics, atom interferometry, and atom transport.

[1]  Verhaar,et al.  Threshold and resonance phenomena in ultracold ground-state collisions. , 1993, Physical review. A, Atomic, molecular, and optical physics.

[2]  Holland,et al.  Time-dependent solution of the nonlinear Schrödinger equation for Bose-condensed trapped neutral atoms. , 1995, Physical review. A, Atomic, molecular, and optical physics.

[3]  C. Wieman,et al.  Controlled collapse of a Bose-Einstein condensate. , 2001, Physical review letters.

[4]  Magnetic field dependence of ultracold inelastic collisions near a feshbach resonance , 2000, Physical review letters.

[5]  Phillips,et al.  Generating solitons by phase engineering of a bose-einstein condensate , 2000, Science.

[6]  M D Barrett,et al.  All-optical formation of an atomic Bose-Einstein condensate. , 2001, Physical review letters.

[7]  M. Mewes,et al.  Sympathetic cooling of bosonic and fermionic lithium gases towards quantum degeneracy , 2001 .

[8]  Dynamics of the Bose-Einstein condensate: quasi-one-dimension and beyond , 2000, cond-mat/0004287.

[9]  G Ferrari,et al.  Quasipure Bose-Einstein condensate immersed in a Fermi sea. , 2001, Physical review letters.

[10]  H. Herrero,et al.  Bose-Einstein solitons in highly asymmetric traps , 1998 .

[11]  W. Ketterle,et al.  Observation of Feshbach resonances in a Bose–Einstein condensate , 1998, Nature.

[12]  C. Sackett,et al.  Bose-Einstein Condensation of Lithium: Observation of Limited Condensate Number , 1997 .

[13]  Yu. Kagan,et al.  COLLAPSE AND BOSE-EINSTEIN CONDENSATION IN A TRAPPED BOSE GAS WITH NEGATIVE SCATTERING LENGTH , 1998 .

[14]  S. Burger,et al.  Dark solitons in Bose-Einstein condensates , 1999, QELS 2000.