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- W1533338945 abstract "Motivated by the recent efforts in creating flat bands in ultra-cold atomic system, we focus on how to probe the band's flatness by Bragg spectroscopy provided that a flat band has been created. Noticing that the band's flatness can be characterized by the effective mass and therefore manifest itself in the excitation spectrum based on the Feynman's relation, we calculate the dynamic structure factor of an optically-trapped spin-orbit coupled Bose-Einstein condensate. Our results show that the excitation spectrum of model system with a perfect flat band can turn to be quadratic in high contrast with that the spectrum is linear to the momentum in an ordinary band case. We suggest that the flatness can be probed by observing the crossover of excitation spectrum dispersion from quadratic to linear to the transferred momentum. Our predictions of the effects of the band's flatness on the excitation spectrum can be tested by the Bragg spectroscopy experimentally." @default.
- W1533338945 created "2016-06-24" @default.
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- W1533338945 date "2014-10-20" @default.
- W1533338945 modified "2023-09-27" @default.
- W1533338945 title "Bragg Spectroscopy Probing Flat Band of an Optically-Trapped Spin-Orbital Coupled Bose Gas" @default.
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