Publications associated with Condensed Matter Theory

Floquet quantum criticality.

Proceedings of the National Academy of Sciences of the United States of America 115 (2018) 9491-9496

W Berdanier, M Kolodrubetz, SA Parameswaran, R Vasseur

We study transitions between distinct phases of one-dimensional periodically driven (Floquet) systems. We argue that these are generically controlled by infinite-randomness fixed points of a strong-disorder renormalization group procedure. Working in the fermionic representation of the prototypical Floquet Ising chain, we leverage infinite randomness physics to provide a simple description of Floquet (multi)criticality in terms of a distinct type of domain wall associated with time translational symmetry-breaking and the formation of "Floquet time crystals." We validate our analysis via numerical simulations of free-fermion models sufficient to capture the critical physics.

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