Nonergodic dynamics of the one-dimensional Bose-Hubbard model with a trapping potential

Nonergodic dynamics of the one-dimensional Bose-Hubbard model with a trapping potential
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具有俘获势的一维 Bose-Hubbard 模型的非遍历动力学

DOI:
10.1103/physreva.104.043322
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发表时间:
2021
期刊:
影响因子:
2.9
通讯作者:
Masaya Kunimi and Ippei Danshita
Masaya Kunimi and Ippei Danshita
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
上西慧理子;森貴司;菅原道彦;山本直樹;Linyu Peng;Masaya Kunimi and Ippei Danshita

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We investigate nonergodic behavior of the one-dimensional Bose-Hubbard model, which emerges in the unitary quantum dynamics starting with initial-statein the presence of a trapping potential. We compute the level spacing statistic, the time evolution of the number imbalance between the odd and the even sites, and the entanglement entropy in order to show that the system exhibits nonergodicity in a strongly interacting regime. The trapping potential enhances nonergodicity even when the trapping potential is weak compared to the hopping energy. We derive the effective spin-1/2Hamiltonian for the strongly interacting regimes by using a perturbation method. On the basis of the effective Hamiltonian, we show that the trapping potential is effectively strengthened by the on-site interaction, leading to the enhancement of the nonergodic behavior. We also calculate the real-time dynamics under the effective Hamiltonian and find that the entanglement entropy grows logarithmically in time.
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