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    Fractal universality in near-threshold magnetic lanthanide dimers

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    Name:
    Fractal universality in near-t ...
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    Genre
    Journal Article
    Date
    2018-02-01
    Author
    Makrides, C
    Li, M
    Tiesinga, E
    Kotochigova, S
    Subject
    cond-mat.dis-nn
    cond-mat.dis-nn
    cond-mat.quant-gas
    quant-ph
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/4795
    
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    DOI
    10.1126/sciadv.aap8308
    Abstract
    The Authors Copyright © 2018. Ergodic quantum systems are often quite alike, whereas nonergodic, fractal systems are unique and display characteristic properties. We explore one of these fractal systems, weakly bound dysprosium lanthanide molecules, in an external magnetic field. As recently shown, colliding ultracold magnetic dysprosium atoms display a soft chaotic behavior with a small degree of disorder. We broaden this classification by investigating the generalized inverse participation ratio and fractal dimensions for large sets of molecular wave functions. Our exact close-coupling simulations reveal a dynamic phase transition from partially localized States to totally delocalized States and universality in its distribution by increasing the magnetic field strength to only a hundred Gauss (or 10 mT). Finally, we prove the existence of nonergodic delocalized phase in the system and explain the violation of ergodicity by strong coupling between near-threshold molecular States and the nearby continuum.
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    American Association for the Advancement of Science (AAAS)
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    Science Advances
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    http://dx.doi.org/10.34944/dspace/4777
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