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arXiv 2008.11537cond-mat.str-el
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长程相互作用下二维三角形伊辛晶格动力学性质的数值研究

Numerical Probe of Dynamical Properties of a Two-Dimensional Triangular Ising Lattice with Long-Range Interaction

Tomohiro Hashizume

摘要:

受2012年国家标准与技术研究所实验实现的二维三角自旋晶格的启发,我们开发了一种新的算法,该算法允许MPS与具有长程相互作用的哈密顿量的时间演化。该算法是基于广义Suzuki-Trotter分解与Krylov子空间扩展步骤。在基准测试中,它预测了正确的5个小数位内的局部磁化行为,直到t \sim 8,它提供了正确的Haldane-Shastry模型的基态能量,直到4个小数位的进化与64个站点;它给出了一个全局磁化行为,这与时间相关的变分原理算法一致。将该算法应用于无限长圆柱表面三角伊辛格点的全局熄灭问题。该算法成功地显示了热化的初始状态后,深淬火证明该算法的准二维系统中的时间演化。

英文摘要:

Motivated by the experimental realisation of the two-dimensional triangular spin lattice at the National Instate of Standards and Technology in 2012, we developed a new algorithm which allows a time evolution of an MPS with a Hamiltonian with long-range interactions. The algorithm is based on generalised Suzuki-Trotter decompositions with Krylov subspace expansion steps. In the benchmark tests, it predicted the correct local magnetisation behaviour within 5 decimal places up to t\sim 8, it provided the ground state energy of Haldane-Shastry odel correctly up to 4 decimal places for evolution with 64 sites; and it gave a global magnetisation behaviour which agrees with Time Dependent Variational Principle algorithm. The algorithm is applied to a global quench on the triangular Ising lattice on the surface of an infinite cylinder. The algorithm successfully showed the thermalisation of the initial state after a deep quench proving that the algorithm works on time evolutions in a quasi-two-dimensional system.

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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