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- W2046168155 abstract "We present experimental evidence showing that an interacting Bose condensate in a shaken optical lattice develops a roton-maxon excitation spectrum, a feature normally associated with superfluid helium. The roton-maxon feature originates from the double-well dispersion in the shaken lattice, and can be controlled by both the atomic interaction and the lattice modulation amplitude. We determine the excitation spectrum using Bragg spectroscopy and measure the critical velocity by dragging a weak speckle potential through the condensate-both techniques are based on a digital micromirror device. Our dispersion measurements are in good agreement with a modified Bogoliubov model." @default.
- W2046168155 created "2016-06-24" @default.
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- W2046168155 date "2015-02-03" @default.
- W2046168155 modified "2023-10-17" @default.
- W2046168155 title "Roton-Maxon Excitation Spectrum of Bose Condensates in a Shaken Optical Lattice" @default.
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- W2046168155 doi "https://doi.org/10.1103/physrevlett.114.055301" @default.
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