Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.150401
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Funding
- DOE [DE-FG02-97ER41014, DE-FC02-07ER41457, DE-AC05-760RL01830, B-AC02-05CH11231, DE-AC05-00OR22725]
- NSF [MRI PHY-0922770]
- Division Of Physics
- Direct For Mathematical & Physical Scien [0922770] Funding Source: National Science Foundation
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We show that in the collision of two superfluid fermionic atomic clouds one observes the formation of quantum shock waves as discontinuities in the number density and collective flow velocity. Domain walls, which are topological excitations of the superfluid order parameter, are also generated and exhibit abrupt phase changes by pi and slower motion than the shock waves. The domain walls are distinct from the gray soliton train or number density ripples formed in the wake of the shock waves and observed in the collisions of superfluid bosonic atomic clouds. Domain walls with opposite phase jumps appear to collide elastically.
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