Quench spectroscopy and correlation imaging show that sound, group, and phase velocities separate into a hierarchy across the superfluid-to-Mott-insulator transition in a 1D Bose-Hubbard gas.
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Observing the emergence of a velocity hierarchy in matter waves
Quench spectroscopy and correlation imaging show that sound, group, and phase velocities separate into a hierarchy across the superfluid-to-Mott-insulator transition in a 1D Bose-Hubbard gas.