首页|Dynamical localization in a non-Hermitian Floquet synthetic system

Dynamical localization in a non-Hermitian Floquet synthetic system

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We investigate the non-Hermitian effects on quantum diffusion in a kicked rotor model where the complex kicking potential is quasi-periodically modulated in the time domain.The synthetic space with arbitrary dimension can be created by incorporating incommensurate frequencies in the quasi-periodical modulation.In the Hermitian case,strong kicking induces the chaotic diffusion in the four-dimension momentum space characterized by linear growth of mean energy.We find that the quantum coherence in deep non-Hermitian regime can effectively suppress the chaotic diffusion and hence result in the emergence of dynamical localization.Moreover,the extent of dynamical localization is dramatically enhanced by increasing the non-Hermitian parameter.Interestingly,the quasi-energies become complex when the non-Hermitian parameter exceeds a certain threshold value.The quantum state will finally evolve to a quasi-eigenstate for which the imaginary part of its quasi-energy is large most.The exponential localization length decreases with the increase of the non-Hermitian parameter,unveiling the underlying mechanism of the enhancement of the dynamical localization by non-Hermiticity.

Floquet systemnon-Hermitian physicsdynamical localization

可汗、张嘉明、霍良、赵文垒

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School of Science,Jiangxi University of Science and Technology,Ganzhou 341000,China

School of Information Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China

国家自然科学基金国家自然科学基金Science and Technology Planning Project of Jiangxi Province of ChinaScience and Technology Planning Project of Jiangxi Province of China

120650091236500220224ACB20100620224BAB201023

2024

10.1088/1674-1056/ad36bb

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(5)
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