arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.12928cond-mat.str-elcond-mat.stat-mechphysics.comp-ph
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有限温度量子态的连续矩阵乘积算符方法

Continuous matrix product operator approach to finite temperature quantum states

Wei Tang, Hong-Hao Tu, Lei Wang

摘要:

我们提出了一种利用连续矩阵乘积算符表示研究有限温度下量子系统的算法。该方法处理短程和长程相互作用的热力学限制,而不会产生任何时间离散化误差。此外,该方法提供了直接访问的物理观测,包括比热,局部磁化率和局部光谱函数。在用原型量子XXZ链验证了该方法的有效性后,我们将其分别应用于具有幂律衰减相互作用的量子伊辛模型和无限长圆柱上.该方法提供的预测是相关的量子模拟器和核磁共振自旋晶格弛豫率的实验。

英文摘要:

We present an algorithm for studying quantum systems at finite temperature using continuous matrix product operator representation. The approach handles both short-range and long-range interactions in the thermodynamic limit without incurring any time discretization error. Moreover, the approach provides direct access to physical observables including the specific heat, local susceptibility, and local spectral functions. After verifying the method using the prototypical quantum XXZ chains, we apply it to quantum Ising models with power-law decaying interactions and on the infinite cylinder, respectively. The approach offers predictions that are relevant to experiments in quantum simulators and the nuclear magnetic resonance spin-lattice relaxation rate.

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