Emergent hydrodynamics in a strongly interacting dipolar spin ensemble
Emergent hydrodynamics in a strongly interacting dipolar spin ensemble
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DOI：
10.1038/s41586-021-03763-1
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发表时间：
2021-04
期刊：
影响因子：
64.8
通讯作者：
C. Zu;Francisco Machado;B. Ye;S. Choi;B. Kobrin;T. Mittiga;S. Hsieh;P. Bhattacharyya;M. Markham;D. Twitchen;A. Jarmola;D. Budker;C. Laumann;J. E. Moore;N. Yao
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文献类型：
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作者：
C. Zu;Francisco Machado;B. Ye;S. Choi;B. Kobrin;T. Mittiga;S. Hsieh;P. Bhattacharyya;M. Markham;D. Twitchen;A. Jarmola;D. Budker;C. Laumann;J. E. Moore;N. Yao
传统观点认为，宏观经典现象自然地从微观量子定律中产生，，，，，，，-。然而，尽管有这样的口头禅，在这两种描述之间建立直接联系仍然是一个持久的科学挑战。特别是，很难从通用的微观量子哈密顿量 , , , , , , – 定量预测系统出现的“经典”特性（例如扩散率、粘度和可压缩性）。在这里，我们引入了一种混合固态自旋平台，其中潜在的无序偶极量子哈密顿量导致了纳米长度尺度上非常规自旋扩散的出现。特别是，位置无序和现场随机场的组合导致了菲克但非高斯的扩散动力学， , , , – 。最后，通过静态场和驱动场的组合调整自旋哈密顿量内的基础参数，我们演示了对出现的自旋扩散系数的直接控制。我们的工作能够研究多体量子自旋系统中的流体动力学。
Conventional wisdom holds that macroscopic classical phenomena naturally emerge from microscopic quantum laws, , , , , –. However, despite this mantra, building direct connections between these two descriptions has remained an enduring scientific challenge. In particular, it is difficult to quantitatively predict the emergent ‘classical’ properties of a system (for example, diffusivity, viscosity and compressibility) from a generic microscopic quantum Hamiltonian, , , , , , –. Here we introduce a hybrid solid-state spin platform, where the underlying disordered, dipolar quantum Hamiltonian gives rise to the emergence of unconventional spin diffusion at nanometre length scales. In particular, the combination of positional disorder and on-site random fields leads to diffusive dynamics that are Fickian yet non-Gaussian, , , , –. Finally, by tuning the underlying parameters within the spin Hamiltonian via a combination of static and driven fields, we demonstrate direct control over the emergent spin diffusion coefficient. Our work enables the investigation of hydrodynamics in many-body quantum spin systems.