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arXiv 2409.12908cond-mat.quant-gas
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二维光学晶格中Hubbard相互作用的微观理论

Microscopic theory of the Hubbard interaction in low-dimensional optical lattices

Haydn S. Adlong, Jesper Levinsen, Meera M. Parish

AI总结:

本文提出了一种二维光学晶格中Hubbard相互作用的微观理论,通过精确计算低能散射振幅,揭示了晶格诱导共振现象,并与实验测量结果一致。

摘要:

Hubbard模型是强关联量子物质的典范模型,因此使用量子模拟器如超冷原子气体来研究具有吸引力。本文考虑了在准一维或准二维光学晶格中两个原子相互作用的问题,这些几何结构在量子气体显微镜实验中经常被实现。我们进行了低能散射振幅的精确计算,考虑了横向约束的影响以及所有更高Bloch能带。这超越了标准微扰处理,使我们能够精确确定任意s波散射长度的有效Hubbard onsite相互作用(见来源代码可用在[1])。特别是,我们发现Hubbard onsite相互作用在散射长度约为晶格间距的范围内表现出由晶格诱导的共振,这在当前实验范围内是可行的。此外,我们展示了我们的结果与准二维正方形光学晶格中量子气体显微镜的Hubbard相互作用光谱测量结果高度一致。我们的形式化方法非常通用,可以扩展到多能带模型和其他原子样情景在晶格几何中,如莫尔超晶格中的激子-激子和激子-电子散射。

英文摘要:

The Hubbard model is a paradigmatic model of strongly correlated quantum matter, thus making it desirable to investigate with quantum simulators such as ultracold atomic gases. Here, we consider the problem of two atoms interacting in a quasi-one- or quasi-two-dimensional optical lattice, geometries which are routinely realized in quantum-gas-microscope experiments. We perform an exact calculation of the low-energy scattering amplitude which accounts for the effects of the transverse confinement as well as all higher Bloch bands. This goes beyond standard perturbative treatments and allows us to precisely determine the effective Hubbard on-site interaction for arbitrary $s$-wave scattering length (see source code available at [1]). In particular, we find that the Hubbard on-site interaction displays lattice-induced resonances for scattering lengths on the order of the lattice spacing, which are well within reach of current experiments. Furthermore, we show that our results are in excellent agreement with spectroscopic measurements of the Hubbard interaction for a quasi-two-dimensional square optical lattice in a quantum gas microscope. Our formalism is very general and may be extended to multi-band models and other atom-like scenarios in lattice geometries, such as exciton-exciton and exciton-electron scattering in moiré superlattices.

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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