Multiple scattering dynamics of fermions at an isolated p-wave resonance

Abstract

The wavefunction for indistinguishable fermions is anti-symmetric under particle exchange, which directly leads to the Pauli exclusion principle, and hence underlies the structure of atoms and the properties of almost all materials. In the dynamics of collisions between two indistinguishable fermions this requirement strictly prohibits scattering into 90 degree angles. Here we experimentally investigate the collisions of ultracold clouds fermionic ${}^{40}\mathrm{K}$ atoms by directly measuring scattering distributions. With increasing collision energy we identify the Wigner threshold for p-wave scattering with its tell-tale dumb-bell shape and no $90^{\circ }$ yield. Above this threshold effects of multiple scattering become manifest as deviations from the underlying binary p-wave shape, adding particles either isotropically or axially. A shape resonance for ${}^{40}\mathrm{K}$ facilitates the separate observation of these two processes. The isotropically enhanced multiple scattering mode is a generic p-wave threshold phenomenon, while the axially enhanced mode should occur in any colliding particle system with an elastic scattering resonance.

arXiv comment7 pages, 4 figures, link to supplementary material

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Cited by in corpus (11)

• Homogeneous Atomic Fermi Gases
• Observation of Pauli blocking in light scattering from quantum degenerate fermions
• Observation of bound state self-interaction in a nano-eV atom collider
• Above threshold scattering about a Feshbach resonance for ultracold atoms in an optical collider
• Anisotropic collisions of dipolar Bose-Einstein condensates in the universal regime
• Crossover from the Ultracold to the Quasiclassical Regime in State-Selected Photodissociation
• Experimental observation of the avoided crossing of two $S$-matrix resonance poles in an ultracold atom collider
• Observation of the P-wave Shape Resonance
• Diffraction of strongly interacting molecular Bose-Einstein condensate from standing wave light pulses
• Quantum Scattering in an Optical Collider for Ultracold Atoms
• Observation of Fermi acceleration with cold atoms