arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.00288cond-mat.quant-gasphysics.optics
收藏

量子多体动力学焦散线

Caustics in quantum many-body dynamics

W. Kirkby, Y. Yee, K. Shi, D. H. J. O'Dell

摘要:

我们描述了一类新的非平衡量子多体现象的形式网络的焦散线,占主导地位的多体波函数在半经典制度突然淬火。它包括光锥状传播的相关性作为一个特殊的情况。焦散线是由波的出生和死亡形成的奇点,并形成了一个普遍模式的层次结构,其自然的数学描述是通过突变理论。经典波的例子从光学中的彩虹和引力透镜到流体力学中的涌潮和流氓波。量子多体焦散线通过二次量子化(“量子灾变”)离散化,并存在于可能具有许多维度的Fock空间中。我们说明这些想法使用的玻色哈伯德二聚体和三聚体模型是足够简单的焦散结构可以阐明从第一原理,但运行的全范围从可积到nonintegrable动态。二聚体产生折叠和尖点突变的离散化版本,而三聚体允许更高的突变,包括余维3双曲和椭圆脐,其由8维corank-2突变(称为$X_9$)组织和投影。这些结果描述了一种迄今未被认识的形式的普遍性在量子动力学组织的奇点,表现为强烈的波动模式人口的概率。

英文摘要:

We describe a new class of nonequilibrium quantum many-body phenomena in the form of networks of caustics that dominate the many-body wavefunction in the semiclassical regime following a sudden quench. It includes the light cone-like propagation of correlations as a particular case. Caustics are singularities formed by the birth and death of waves and form a hierarchy of universal patterns whose natural mathematical description is via catastrophe theory. Examples in classical waves range from rainbows and gravitational lensing in optics to tidal bores and rogue waves in hydrodynamics. Quantum many-body caustics are discretized by second-quantization (``quantum catastrophes'') and live in Fock space which can potentially have many dimensions. We illustrate these ideas using the Bose Hubbard dimer and trimer models which are simple enough that the caustic structure can be elucidated from first principles and yet run the full range from integrable to nonintegrable dynamics. The dimer gives rise to discretized versions of fold and cusp catastrophes whereas the trimer allows for higher catastrophes including the codimension-3 hyperbolic and elliptic umbilics which are organized by, and projections of, an 8-dimensional corank-2 catastrophe known as $X_9$. These results describe a hitherto unrecognized form of universality in quantum dynamics organized by singularities that manifest as strong fluctuations in mode population probabilities.

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。

↑