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arXiv 2108.04320cond-mat.str-el
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具有线缺陷的非阿贝尔Kitaev自旋液体中的无隙激发

Gapless excitations in non-Abelian Kitaev spin liquids with line defects

Lucas R. D. Freitas, Rodrigo G. Pereira

摘要:

我们发现,线缺陷在非阿贝尔Kitaev自旋液体港口无隙的一维马约拉纳模式,如果跨缺陷的相互作用低于一个临界值。在平均场近似下处理线缺陷处的弱相互作用,我们确定了临界相互作用强度作为外部磁场的函数。在无带隙的制度,我们使用低能有效场论计算的自旋晶格弛豫率的核自旋附近的缺陷,并找到一个立方温度依赖性,同意在Kitaev材料$α\text{-RuCl}_3$的实验。

英文摘要:

We show that line defects in a non-Abelian Kitaev spin liquid harbor gapless one-dimensional Majorana modes if the interaction across the defect falls below a critical value. Treating the weak interaction at the line defect within a mean-field approximation, we determine the critical interaction strength as a function of the external magnetic field. In the gapless regime, we use the low-energy effective field theory to calculate the spin-lattice relaxation rate for a nuclear spin near the defect and find a cubic temperature dependence that agrees with experiments in the Kitaev material $α\text{-RuCl}_3$.

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