Kolodrubetz, Michael
Permanent URI for this collectionhttps://hdl.handle.net/10735.1/6204
Michael Kolodrubetz is an Assistant Professor of Physics. His research interests include:
- Periodically-driven systems
- Geometry and dynamics
- Controlled quantum systems
- Kibble-Zurek scaling
- Thermalization and ergodicity
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2020 recipient of an NSF CAREER award.
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Browsing Kolodrubetz, Michael by Subject "Floquet theory"
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Item Absence of Thermalization in Finite Isolated Interacting Floquet Systems(Amer Physical Soc, 2018-10-22) Seetharam, Karthik; Titum, Paraj; Kolodrubetz, Michael; Refael, Gil; Kolodrubetz, MichaelConventional wisdom suggests that the long-time behavior of isolated interacting periodically driven (Floquet) systems is a featureless maximal-entropy state characterized by an infinite temperature. Efforts to thwart this uninteresting fixed point include adding sufficient disorder to realize a Floquet many-body localized phase or working in a narrow region of drive frequencies to achieve glassy nonthermal behavior at long time. Here we show that in clean systems the Floquet eigenstates can exhibit nonthermal behavior due to finite system size. We consider a one-dimensional system of spinless fermions with nearest-neighbor interactions where the interaction term is driven. Interestingly, even with no static component of the interaction, the quasienergy spectrum contains gaps and a significant fraction of the Floquet eigenstates, at all quasienergies, have nonthermal average doublon densities. We show that this nonthermal behavior arises due to emergent integrability at large interaction strength and discuss how the integrability breaks down with power-law dependence on system size.Item Floquet Quantum Criticality(National Academy of Sciences) Berdanier, W.; Kolodrubetz, Michael; Parameswaran, S. A.; Vasseur, R.; 0000-0001-5628-3300 (Kolodrubetz, M); Kolodrubetz, MichaelWe 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.