Journal
PHYSICAL REVIEW B
Volume 97, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.97.014311
Keywords
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Funding
- Laboratory Directed Research and Development from Berkeley Laboratory by the Office of Science, of the US Department of Energy [DEAC02-05CH11231]
- US DOE, Office of Science, Basic Energy Sciences, as part of the TIMES initiative
- NSF [DMR-1410435]
- Institute of Quantum Information and Matter, an NSF Frontier center - Gordon and Betty Moore Foundation
- Packard Foundation
- ARO MURI - US Army [W911NF-16-1-0361]
- NSF Graduate Research Fellowship Program
- National Research Council postdoctoral fellowship
- ARL CDQI
- NSF PFC at JQI
- ARO
- AFOSR
- ARO MURI
- NSF QIS
- Division Of Physics
- Direct For Mathematical & Physical Scien [1430094] Funding Source: National Science Foundation
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Conventional 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.
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