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相互作用诱导的连续谱中多粒子束缚态

Interaction-induced multiparticle bound states in the continuum

Boning Huang, Yongguan Ke, Honghua Zhong, Yuri S. Kivshar, Chaohong Lee

备注：
Accepted by Phys. Rev. Lett
发表信息：
Phys. Rev. Lett. 133, 140202 (2024)
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AI总结：

本文在相互作用调制的Bose-Hubbard模型中预言多粒子准BIC，并通过时空调制在位相互作用实现其Thouless泵浦。

摘要：

连续谱中的束缚态（BICs）是位于辐射连续谱中的局域模式。它们最初是针对单粒子态被预言的，并已成为许多波动系统的普遍特征。在多体量子物理中，目前仍不清楚什么才是BICs的紧密对应物，以及粒子间相互作用是否能够诱导BICs。在这里，我们预言了相互作用调制的Bose-Hubbard模型中一类新型多粒子态，它们可以与BIC概念相关联。在周期性边界条件下，一种所谓的准BIC表现为一个束缚对，驻留在由第三个粒子形成的驻波中。在开放边界条件下，这种混合态成为系统的一个本征态。我们证明，通过在空间和时间上调制在位相互作用，可以实现准BICs的Thouless泵浦。令人惊讶的是，尽管准BIC的质心在一个周期内移动一个晶胞，该束缚对却随驻波沿相反方向运动。

英文摘要：

Bound states in the continuum (BICs) are localized modes residing in the radiation continuum. They were first predicted for single-particle states, and became a general feature of many wave systems. In many-body quantum physics, it is still unclear what would be a close analog of BICs, and whether interparticle interaction may induce BICs. Here, we predict a novel type of multiparticle states in the interaction-modulated Bose-Hubbard model that can be associated with the BIC concept. Under periodic boundary conditions, a so-called quasi-BIC appears as a bound pair residing in a standing wave formed by the third particle. Under open boundary conditions, such a hybrid state becomes an eigenstate of the system. We demonstrate that the Thouless pumping of the quasi-BICs can be realized by modulating the onsite interactions in space and time. Surprisingly, while the center-of-mass of the quasi-BIC is shifted by a unit cell in one cycle, the bound pair moves in the opposite direction with the standing wave.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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