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arXiv 2106.09324quant-phcond-mat.stat-mechcond-mat.str-elmath-phmath.MPmath.QA
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用新方法求解玻色-哈伯德模型

Solving the Bose-Hubbard model in new ways

A. P. Sowa, J. Fransson

摘要:

本文介绍一种分析具有近邻相互作用玻色子阵列的玻色-哈伯德模型的新方法。它是基于数论实现的创建和湮灭运营商,构成的模型。这种方法的优点之一是它便于任意精度的计算,从而实现近乎完美的数值实验。特别是,我们提供了一个严格的计算机辅助证明的量子相变在有限系统的这种类型。此外,我们还通过正有理数乘法群上的调和分析研究了无限阵列的性质。这将一个同构化,它将底层的Fock空间重塑为Hecke空间的无限张量积,即,平方可积周期函数的空间是非负频率谐波的叠加。在这种同构下,数论的产生和湮灭算子被映射到圆上谐振子的Kastrup模型中。它还使我们能够突出的亲属关系的模型在手的一系列自旋矩与局部各向异性场。这识别了一个有趣的物理系统,可以映射到手头的模型中。

英文摘要:

We introduce a new method for analysing the Bose-Hubbard model for an array of bosons with nearest neighbor interactions. It is based on a number-theoretic implementation of the creation and annihilation operators that constitute the model. One of the advantages of this approach is that it facilitates computation with arbitrary accuracy, enabling nearly perfect numerical experimentation. In particular, we provide a rigorous computer assisted proof of quantum phase transitions in finite systems of this type. Furthermore, we investigate properties of the infinite array via harmonic analysis on the multiplicative group of positive rationals. This furnishes an isomorphism that recasts the underlying Fock space as an infinite tensor product of Hecke spaces, i.e., spaces of square-integrable periodic functions that are a superposition of non-negative frequency harmonics. Under this isomorphism, the number-theoretic creation and annihilation operators are mapped into the Kastrup model of the harmonic oscillator on the circle. It also enables us to highlight a kinship of the model at hand with an array of spin moments with a local anisotropy field. This identifies an interesting physical system that can be mapped into the model at hand.

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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