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arXiv 1909.09360cond-mat.str-el
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Kitaev量子自旋液体中的声子重整化

Phonon renormalization in the Kitaev quantum spin liquid

Alexandros Metavitsiadis, Wolfram Brenig

摘要:

本文研究了蜂窝晶格上磁弹性耦合到二维Kitaev自旋模型的声子的自能。磁矩分解成移动的马约拉纳物质和静态的$\mathbb{Z}_{2}$规范场导致一个连续的弛豫过程,包括两个通道。热通量激发作为一种突现无序,强烈影响声子重整化。以上的通量增殖温度,一个狭窄的准粒子空穴通道的色散被抑制有利于广泛的,只有弱动量依赖的功能,覆盖大的光谱范围。我们的分析是基于补充计算的低温均匀规范和平均场治疗的热规范波动,有效的中高温。

英文摘要:

We study the self-energy of phonons, magnetoelastically coupled to the two-dimensional Kitaev spin-model on the honeycomb lattice. Fractionalization of magnetic moments into mobile Majorana matter and a static $\mathbb{Z}_{2}$ gauge field lead to a continuum of relaxation processes comprising two channels. Thermal flux excitations, which act as an emergent disorder, strongly affect the phonon renormalization. Above the flux proliferation temperature, the dispersion of a narrow quasiparticle-hole channel is suppressed in favor of broad and only weakly momentum dependent features, covering large spectral ranges. Our analysis is based on complementary calculations in the low-temperature homogeneous gauge and a mean-field treatment of thermal gauge fluctuations, valid at intermediate and high temperatures.

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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