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    Negative-mass effects in spin-orbit coupled Bose-Einstein condensates

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    Authors
    Colas, David
    Laussy, Fabrice P.
    Davis, Matthew J.
    Issue Date
    2018-07-31
    
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    Abstract
    Negative effective masses can be realized by engineering the dispersion relation of a variety of quantum systems. A recent experiment with spin-orbit coupled Bose-Einstein condensates has shown that a negative effective mass can halt the free expansion of the condensate and lead to fringes in the density [M. A. Khamehchi et al., Phys. Rev. Lett. 118, 155301 (2017)]. Here, we show that the underlying cause of these observations is the self-interference of the wave packet that arises when only one of the two effective mass parameters that characterize the dispersion of the system is negative. We show that spin-orbit coupled Bose-Einstein condensates may access regimes where both mass parameters controlling the propagation and diffusion of the condensate are negative, which leads to the novel phenomenon of counterpropagating self-interfering packets.
    Publisher
    APS
    Journal
    Physical Review Letters
    URI
    http://hdl.handle.net/2436/621719
    DOI
    10.1103/PhysRevLett.121.055302
    Additional Links
    https://link.aps.org/doi/10.1103/PhysRevLett.121.055302
    Type
    Journal article
    Language
    en
    ISSN
    0031-9007
    1079-7114
    Sponsors
    EU project polaflow
    ae974a485f413a2113503eed53cd6c53
    10.1103/PhysRevLett.121.055302
    Scopus Count
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    Faculty of Science and Engineering

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