arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.11599cond-mat.str-el
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二维横向伊辛模型的量子临界动力学

Quantum critical dynamics in two-dimensional transverse Ising model

Chisa Hotta, Tempei Yoshida, Kenji Harada

摘要:

在量子临界点(QCP)附近,热力学性质由普适指数决定,向零温度发散。虽然这一事实是众所周知的,但它如何反映在量子动力学中还没有得到解决。作为一个理想的实验平台来测试这个问题,我们考虑了一个有机莫特绝缘体的介电自由度,量子电偶极子,是由横向伊辛模型的三角形晶格,具有QCP描述。我们通过构建基于量子蒙特卡罗方法的动力学协议来跟踪模型的Glauber型动力学。动力学磁化率的德拜函数的形式,并显示出一个显着的峰变窄,在接近QCP由于发散的弛豫时标。它类似于在有机材料\k{appa}-ET 2 X二聚体Mott绝缘相中观察到的介电常数异常,表明该材料非常接近铁电QCP。

英文摘要:

In the vicinity of the quantum critical point(QCP), thermodynamic properties diverge toward zero temperature governed by universal exponents. Although this fact is well known, how it is reflected in quantum dynamics has not been addressed. As an ideal experimental platform to test the issue, we consider an organic Mott insulator whose dielectric degrees of freedom, a quantum electric dipole, is described by the transverse Ising model on a triangular lattice that has a QCP. We track the Glauber-type dynamics of the model by constructing a kinetic protocol based on the quantum Monte Carlo method. The dynamical susceptibility takes the form of the Debye function and shows a significant peak-narrowing in approaching a QCP due to the divergence of the relaxation timescale. It resembles the anomaly of dielectric constants observed in the organic materials \k{appa}-ET 2 X dimer Mott insulating phase, indicating that the material is very near the ferroelectric QCP.

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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