论文标题

局部驱动的量子磁铁的真实空间热化

Real space thermalization of locally driven quantum magnets

论文作者

Melendrez, Ronald, Mukherjee, Bhaskar, Sharma, Prakash, Pal, Arijeet, Changlani, Hitesh J.

论文摘要

对隔离系统的热化及其分解的研究导致对非平衡量子状态及其对初始条件的依赖性更深入。量子多体疤痕的存在,具有潜在有效的超蛋白结构,嵌入原本混乱的多体频谱中,量子多体疤痕的存在,最初的作用突出了最初的作用。旋转海森贝格和$ xxz $型号及其在一个和更高维度中的变体已显示可容纳精确的量子多体疤痕,在合成和凝结物质系统中可以实现的旋转螺旋状态的完美复兴。在这些进步的推动下,我们提出了实验可访问的局部,时间依赖性的协议,以探索空间热化曲线,并突出系统的不同部分如何热化和影响Superspin的命运。 We identify distinct parametric regimes for the ferromagnetic ($X$-polarized) initial state based on the interplay between the driven spin and the rest, including local athermal behavior where the driven spin effectively decouples, acting like a ``cold" spot while being instrumental in heating up the other spins. We also identify parameter regimes where the superspin remains resilient to local driving for long time scales. We develop a real and Floquet空间图片解释了我们的数值观察,并做出可以在各种实验设置中进行测试的预测。

The study of thermalization and its breakdown in isolated systems has led to a deeper understanding of non-equilibrium quantum states and their dependence on initial conditions. The role of initial conditions is prominently highlighted by the existence of quantum many-body scars, special athermal states with an underlying effective superspin structure, embedded in an otherwise chaotic many-body spectrum. Spin Heisenberg and $XXZ$ models and their variants in one and higher dimension have been shown to host exact quantum many-body scars, exhibiting perfect revivals of spin helix states that are realizable in synthetic and condensed matter systems. Motivated by these advances, we propose experimentally accessible, local, time-dependent protocols to explore the spatial thermalization profile and highlight how different parts of the system thermalize and affect the fate of the superspin. We identify distinct parametric regimes for the ferromagnetic ($X$-polarized) initial state based on the interplay between the driven spin and the rest, including local athermal behavior where the driven spin effectively decouples, acting like a ``cold" spot while being instrumental in heating up the other spins. We also identify parameter regimes where the superspin remains resilient to local driving for long time scales. We develop a real and Floquet space picture that explains our numerical observations, and make predictions that can be tested in various experimental setups.

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