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19 April 2024 |
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Article overview
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Negative mass hydrodynamics in a spin-orbit--coupled Bose-Einstein condensate | M. A. Khamehchi
; Khalid Hossain
; M. E. Mossman
; Yongping Zhang
; Th. Busch
; Michael McNeil Forbes
; P. Engels
; | Date: |
13 Dec 2016 | Abstract: | Negative mass can be realized in quantum systems by engineering the
dispersion relation. A powerful method is provided by spin-orbit coupling,
which is currently at the center of intense research efforts. Here we measure
an expanding spin-orbit coupled Bose-Einstein condensate whose dispersion
features a region of negative mass. We observe a range of dynamical phenomena,
including the breaking of parity and of Galilean covariance, dynamical
instabilities, and self-trapping. The experimental findings are reproduced by a
single-band Gross-Pitaevskii simulation, demonstrating that the emerging
features -- shockwaves, soliton trains, self-trapping, etc. -- originate from a
modified dispersion. Our work also sheds new light on related phenomena in
optical lattices, where the underlying periodic structure often complicates
their interpretation. | Source: | arXiv, 1612.4055 | Services: | Forum | Review | PDF | Favorites |
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