Highlights
Universal Dynamics of Bosons Across a Quantum Phase Transition

A Bose-Einstein condensate, when shaken appropriately, shows universal dynamics at a ferromagnetic quantum critical point.

By ramping the modulation strength, the emergence and growth of the pseudo-spin fluctuations are universal in the normalized coordinate (bottom graphic, squares), and are in good agreement with theoretical calculations (bottom graph. Line).

We expect this result is generalizable to a large class of quantum critical dynamics in the same universality class.

Sample images exhibit three regimes: a subcritical regime before the transition; a frozen regime beyond the critical point where the fluctuation remains low; and a growth regime in which fluctuation increases and saturates, indicating domain formation.
Sample images exhibit three regimes: a subcritical regime before the transition; a frozen regime beyond the critical point where the fluctuation remains low; and a growth regime in which fluctuation increases and saturates, indicating domain formation.
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