Negative-mass effects in spin-orbit coupled Bose-Einstein condensates
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Issue Date
2018-07-31
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Show full item recordAbstract
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
APSJournal
Physical Review LettersAdditional Links
https://link.aps.org/doi/10.1103/PhysRevLett.121.055302Type
Journal articleLanguage
enISSN
0031-90071079-7114
Sponsors
EU project polaflowae974a485f413a2113503eed53cd6c53
10.1103/PhysRevLett.121.055302
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