An experimental physicist who coauthored a 1997 measurement of sound propagation in a Bose-Einstein condensate. A focused laser beam suddenly changed the trapping potential, launching localized density disturbances. Rapid nondestructive images followed their motion and measured the speed of sound as a function of density, testing the collective excitations predicted by Bogoliubov theory.[ref]
Propagation of Sound in a Bose-Einstein Condensate by M. R. Andrews and others. Abstract, Physical Review Letters 79, 553–556: optical excitation and phase-contrast image sequences
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