Multiple scattering dynamics of fermions at an isolated p-wave resonance
| Autor: | Niels Kjærgaard, Eite Tiesinga, Andrew C. J. Wade, Ryan Thomas, Kris O. Roberts, P. B. Blakie, Amita B. Deb |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Atomic Physics (physics.atom-ph)
Science FOS: Physical sciences General Physics and Astronomy GASES Inelastic scattering 01 natural sciences Resonance (particle physics) ULTRACOLD ATOMS General Biochemistry Genetics and Molecular Biology Article Physics - Atomic Physics 010305 fluids & plasmas symbols.namesake Pauli exclusion principle 0103 physical sciences BOSE 010306 general physics Physics Elastic scattering Condensed Matter::Quantum Gases Quantum Physics Multidisciplinary Phonon scattering Scattering General Chemistry Fermion ANDERSON LOCALIZATION Quantum Gases (cond-mat.quant-gas) symbols LASER Scattering theory Atomic physics Condensed Matter - Quantum Gases Quantum Physics (quant-ph) MATTER |
| Zdroj: | Nature Communications, Vol 7, Iss 1, Pp 1-6 (2016) Nature Communications Thomas, R, Roberts, K O, Tiesinga, E, Wade, A C J, Blakie, P B, Deb, A B & Kjaergaard, N 2016, ' Multiple scattering dynamics of fermions at an isolated p-wave resonance ', Nature Communications, vol. 7, 12069 . https://doi.org/10.1038/ncomms12069 |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/ncomms12069 |
| Popis: | 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 $\rm^{40}K$ 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 $\rm^{40}K$ 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. Comment: 7 pages, 4 figures, link to supplementary material |
| Databáze: | OpenAIRE |
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