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Measurement of the excitation spectrum of a dipolar gas in the macrodroplet regime

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arxiv 2308.00003 v2 pith:77UEMO2B submitted 2023-07-28 cond-mat.quant-gas

classification cond-mat.quant-gas
keywords excitationmacrodropletdipolarmomentapredictedregimespectrumstrong
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The excitation spectrum of a cigar-shaped strongly dipolar quantum gas at the crossover from a Bose-Einstein condensate to a trapped macrodroplet is predicted to exhibit peculiar features - a strong upward shift of low momentum excitation energies together with a strong multi-band response for high momenta. By performing Bragg spectroscopy over a wide range of momenta, we observe both key elements and also confirm the predicted stiffening of excitation modes when approaching the macrodroplet regime. Our measurements are in good agreement with numerical calculations taking into account finite size effects.

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