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17 April 2024 |
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Article overview
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Emergence of chaotic scattering in ultracold Er and Dy | T. Maier
; H. Kadau
; M. Schmitt
; M. Wenzel
; I. Ferrier-Barbut
; T. Pfau
; A. Frisch
; S. Baier
; K. Aikawa
; L. Chomaz
; M. J. Mark
; F. Ferlaino
; C. Makrides
; E. Tiesinga
; A. Petrov
; S. Kotochigova
; | Date: |
17 Jun 2015 | Abstract: | We show that for ultracold magnetic lanthanide atoms chaotic scattering
emerges due to a combination of anisotropic interaction potentials and Zeeman
coupling under an external magnetic field. This scattering is studied in a
collaborative experimental and theoretical effort for both dysprosium and
erbium. We present extensive measurements of their dense magnetic Feshbach
resonance spectra, analyze their statistical properties, and compare to
predictions from a random-matrix-theory inspired model. Furthermore,
theoretical coupled-channels simulations of the molecular Hamiltonian at zero
magnetic field show that short-ranged anisotropic interactions are sufficiently
strong that weakly-bound diatomic levels form overlapping, uncoupled chaotic
series that when combined are randomly distributed. The Zeeman interaction
shifts and couples these levels, leading to a Feshbach spectrum of zero-energy
bound states with nearest-neighbor spacings that changes from randomly to
chaotically distributed for increasing magnetic field. | Source: | arXiv, 1506.5221 | Services: | Forum | Review | PDF | Favorites |
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