Pre-Floquet states facilitating coherent subharmonic response of periodically driven many-body systems

• URL: http://arxiv.org/abs/2504.00578v2
• Date: Sun, 05 Oct 2025 12:48:31 GMT
• Title: Pre-Floquet states facilitating coherent subharmonic response of periodically driven many-body systems
• Authors: Steffen Seligmann, Hamed Koochaki Kelardeh, Martin Holthaus,
• Abstract summary: We demonstrate longtime coherent subharmonic motion of a many-boson system subjected to an external time-periodic driving force.<n>It is argued that even high-order subharmonic response can be systematically engineered, and be observed experimentally.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We demonstrate longtime coherent subharmonic motion of a many-boson system subjected to an external time-periodic driving force. The underlying mechanism is exemplified numerically through analysis of a periodically driven Bose-Hubbard dimer, and clarified conceptually by semiclassical requantization of invariant tubes pertaining to the system's mean-field description. In this way, one arrives at pre-Floquet states that relate to the actual many-body Floquet states in a manner similar to the relation of site-localized Wannier states to lattice-extended Bloch states in solid-state physics. It is argued that even high-order subharmonic response can be systematically engineered, and be observed experimentally, with weakly interacting Floquet condensates comprising a sufficiently large number of particles.

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