An experimental atomic physicist who coauthored a test of dissipation in a Bose-Einstein condensate. A blue-detuned laser beam acted as a moving obstacle inside the gas. Strong heating appeared only above a critical speed, making motion of a controlled perturbation a probe of superfluidity and its breakdown.[ref]
Evidence for a Critical Velocity in a Bose-Einstein Condensed Gas by C. Raman and others. Abstract: moving laser beam and critical onset of heating
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