Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G33: Floquet Systems
11:30 AM–2:18 PM,
Tuesday, March 7, 2023
Room: Room 225
Sponsoring
Unit:
DCMP
Chair: Nishant Agarwal, University of Massachusetts Lowell
Abstract: G33.00002 : Emergent Floquet ground state*
11:42 AM–11:54 AM
Presenter:
Tatsuhiko N Ikeda
(Institute for Solid State Physics, University of Tokyo)
Authors:
Tatsuhiko N Ikeda
(Institute for Solid State Physics, University of Tokyo)
Anatoli S Polkovnikov
(Boston University)
Sho Sugiura
(NTT Research Inc., MIT)
In this talk, we first provide exact-diagonalization results at finite systems, showing that the Floquet ETH can break down in the weak sense for sufficiently high-frequency drives in generic systems. Namely, there can be an exceptional state which does not obey the Floquet ETH and does not heat up to the infinite temperature in the long run. Second, using real-time dynamics approach, we show that the exceptional state, and its thermodynamic-limit counterpart, can be regarded as being adiabatically connected to the ground state of the time-averaged Hamiltonian when we slowly ramp up the driving period from zero.
We propose this adiabatic connection as the operational definition of the emergent Floquet ground state as well as an experimentally feasible procedure to prepare it.
*T. N. I. was supported by JST PRESTO Grant No. JPMJPR2112 and by JSPS KAKENHI Grant No. JP21K13852.
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