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arXiv 1809.08258quant-phcond-mat.str-el
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二维热态的张量网络退火算法

A tensor network annealing algorithm for two-dimensional thermal states

A. Kshetrimayum, M. Rizzi, J. Eisert, R. Orus

摘要:

张量网络方法已经成为捕获强相关物质的强大工具,但是在有限温度下捕获实验上普遍存在的模型族的方法在很大程度上缺乏。我们介绍了一种张量网络算法,能够模拟二维量子晶格系统在热力学极限下的热态。为此,该方法开发了投影纠缠对状态和投影纠缠对运营商的实例。该算法的关键特征是类似于系统从无限温度状态冷却直到其达到所需的有限温度状态。作为基准,我们研究了无限正方形晶格上伊辛模型的有限温度相变,得到了与精确解非常吻合的结果。然后,我们转向研究有限温度下的玻色-哈伯德模型的限制,两个(硬核)和三个玻色子模式每个网站。我们的技术可以用来支持在实验室中的实际有效的二维材料的实验研究,以及基准光晶格量子模拟器与超冷原子。

英文摘要:

Tensor network methods have become a powerful class of tools to capture strongly correlated matter, but methods to capture the experimentally ubiquitous family of models at finite temperature beyond one spatial dimension are largely lacking. We introduce a tensor network algorithm able to simulate thermal states of two-dimensional quantum lattice systems in the thermodynamic limit. The method develops instances of projected entangled pair states and projected entangled pair operators for this purpose. It is the key feature of this algorithm to resemble the cooling down of the system from an infinite temperature state until it reaches the desired finite-temperature regime. As a benchmark we study the finite-temperature phase transition of the Ising model on an infinite square lattice, for which we obtain remarkable agreement with the exact solution. We then turn to study the finite-temperature Bose-Hubbard model in the limits of two (hard-core) and three bosonic modes per site. Our technique can be used to support the experimental study of actual effectively two-dimensional materials in the laboratory, as well as to benchmark optical lattice quantum simulators with ultra-cold atoms.

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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