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We investigate thermalization dynamics of a driven dipolar many-body quantumsystem through the stability of discrete time crystalline order. Using periodicdriving of electronic spin impurities in diamond, we realize different types ofinteractions between spins and demonstrate experimentally that the interplay ofdisorder, driving and interactions leads to several qualitatively distinctregimes of thermalization. For short driving periods, the observed dynamics arewell described by an effective Hamiltonian which sensitively depends oninteraction details. For long driving periods, the system becomes susceptibleto energy exchange with the driving field and eventually enters a universalthermalizing regime, where the dynamics can be described by interaction-induceddephasing of individual spins. Our analysis reveals important differencesbetween thermalization of long-range Ising and other dipolar spin models.

Probing quantum thermalization of a disordered dipolar spin ensemble with discrete time-crystalline order