Metronome spin stabilizes time-crystalline dynamics
We investigate a disorder-free quantum Ising chain subject to a time-periodic drive that rotates each spin by an angle 𝜋(1−𝜀𝑖). In case all spins experience the same deviation 𝜀 and the system is initialized in a fully polarized state, the dynamics is known to be time crystalline: the magnetization...
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| Hauptverfasser: | , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
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3 June 2024
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| In: |
Physical review
Year: 2024, Jahrgang: 109, Heft: 22, Pages: 224301-1-224301-11 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.109.224301 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.109.224301 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.109.224301 
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| Verfasserangaben: | Niklas Euler, Adrian Braemer, Luca Benn, and Martin Gärttner |
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| 520 | |a We investigate a disorder-free quantum Ising chain subject to a time-periodic drive that rotates each spin by an angle (1−). In case all spins experience the same deviation and the system is initialized in a fully polarized state, the dynamics is known to be time crystalline: the magnetization of the system exhibits period-doubled oscillations for timescales that grow exponentially with the length of the chain. In this work, we study the effect of a deviation that differs between spins. We find that reducing for a single spin drastically enhances the lifetime of spatiotemporal order, suggesting the name metronome spin. Employing perturbative arguments in an average Hamiltonian picture, we explain this observation for initial states with macroscopic bulk magnetization. Furthermore, in the case of random bit-string initial states, we report the enhancement of the lifetime of a topological edge mode, which can also be understood in the same picture. Finally, we discuss an altered geometry in which the metronome spin is not directly part of the chain, affecting the dynamics in different ways in the two scenarios considered. Our findings unveil the intricate dynamics that emerge in Floquet systems under the influence of a spatially varying drive, thereby uncovering new avenues for Floquet engineering. | ||
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