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arXiv 1806.09722cond-mat.str-elcond-mat.quant-gas
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平带激发量子自旋模型的猝灭动力学

Quench dynamics of quantum spin models with flat bands of excitations

Raphaël Menu, Tommaso Roscilde

摘要:

我们研究了线性激发谱中具有(近)平带的量子自旋模型中量子猝灭后的幺正演化。受单个囚禁里德伯原子系综视角的启发,我们着重研究了二维晶格中横场-纵场伊辛模型,该模型的特点是由于相消干涉效应(Lieb和Kagomé晶格)或由于子晶格间能量失配(三角晶格)而导致的平带.利用线性自旋波理论,我们表明,量子猝灭,配备单自旋成像,可以直接揭示空间局域化的性质的色散激发,和他们的缓慢传播或缺乏传播。此外,我们表明,傅立叶分析后淬火时间演化的波矢相关的数量允许光谱重建的平带。我们的研究结果铺平了道路,为未来的实验与里德伯量子模拟器,这可以扩展我们的线性自旋波研究的完全非线性制度,其特征在于密集的,强烈的相互作用的气体的无色散激发的外观。

英文摘要:

We investigate the unitary evolution following a quantum quench in quantum spin models possessing a (nearly) flat band in the linear excitation spectrum. Inspired by the perspective offered by ensembles of individually trapped Rydberg atoms, we focus on the paradigmatic trasverse-field Ising model on two dimensional lattices featuring a flat band as a result of destructive interference effects (Lieb and Kagomé lattice); or a nearly flat band due to a strong energy mismatch among sublattices (triangular lattice). Making use of linear spin-wave theory, we show that quantum quenches, equipped with single-spin imaging, can directly reveal the spatially localized nature of the dispersionless excitations, and their slow propagation or lack of propagation altogether. Moreover we show that Fourier analysis applied to the post-quench time evolution of wavevector-dependent quantities allows for the spectroscopic reconstruction of the flat bands. Our results pave the way for future experiments with Rydberg quantum simulators, which can extend our linear spin-wave study to the fully nonlinear regime, characterized by the appearance of dense, strongly interacting gases of dispersionless excitations.

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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