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Self-similar Dynamics of Order Parameter Fluctuations in Pump-probe Experiments by Dolgirev, Pavel E.; Michael, Marios H.; Zong, Alfred; Gedik, Nuh; Demler, Eugene is a scholarly article available to read on EtoBox.

What is Self-similar Dynamics of Order Parameter Fluctuations in Pump-probe Experiments about?

Upon excitation by a laser pulse, broken-symmetry phases of a wide variety of solids demonstrate similar order parameter dynamics characterized by a dramatic slowing down of relaxation for stronger pump fluences. Motivated by this recurrent phenomenology, we develop a simple non-perturbative effective model of dynamics of collective bosonic excitations in pump-probe experiments. We find that as the system recovers after photoexcitation, it shows universal prethermalized dynamics manifesting a power-law, as opposed to exponential, relaxation, explaining the slowing down of the recovery process. For strong quenches, long-wavelength over-populated transverse modes dominate the long-time dynamics; their distribution function exhibits universal scaling in time and space, whose universal exponents can be computed analytically. Our model offers a unifying description of order parameter fluctuations in a regime far from equilibrium, and our predictions can be tested with available time-resolved techniques.

Author

Dolgirev, Pavel E.; Michael, Marios H.; Zong, Alfred; Gedik, Nuh; Demler, Eugene

Published

2019

Language

EN