2026-06-27T15:23:00Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/714892023-08-25T23:28:44Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Muñoz de Nova, Juan Ramón
author
Sols Lucía, Fernando
2023-06-22T10:43:03Z
2023-06-22T10:43:03Z
2022-04-07
2469-9926
10.1103/PhysRevA.105.043302
https://hdl.handle.net/20.500.14352/71489
http://dx.doi.org/10.1103/PhysRevA.105.043302
https://journals.aps.org/
We propose the concept of a spontaneous many-body Floquet state. This is a state that, in the absence of external periodic driving, self-oscillates like in the presence of a periodic Hamiltonian, this behavior being spontaneously induced by many-body interactions. In addition, its quantum fluctuations are described by regular Floquet theory. Furthermore, it is also a time crystal, presenting long-range time-periodic order. However, this crystalline behavior is very different to that of conventional Floquet discrete time crystals: here, there is no external periodic driving, energy is conserved, and the nature of the spontaneous symmetry breaking is continuous instead of discrete. We demonstrate that spontaneous many-body Floquet states can emerge in a variety of canonical many-body problems, ranging from interacting fermions to Bose-Hubbard models. We specifically show that a spontaneous many-body Floquet state is a universal intrinsic state of a one-dimensional flowing atom condensate, both subsonic and supersonic, resulting from a dynamical phase transition and robust against external perturbations and quantum fluctuations, proposing also realistic experimental scenarios for its observation. A spontaneous many-body Floquet state not only represents a realization of a continuous time crystal, but also another paradigm in Floquet physics.
eng
Continuous-time crystal from a spontaneous many-body Floquet state
journal article
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https://docta.ucm.es/bitstreams/7b92c05b-f83c-4ccd-8fb6-91221d238435/download
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4601548
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DeNovaJRM 03 LIBRE.pdf