论文标题
量子异常绝缘子和微不足道绝缘子之间拓扑量子相变的当前尺度尺度
Current scaling of the topological quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator
论文作者
论文摘要
我们报告了当前对量子异常绝缘子和磁性绝缘体磁性绝缘体的量子相变的缩放研究。通过在测量霍尔电导率$σ_{xy} $的同时倾斜磁化来观察到过渡。 $σ_{xy} $的过渡曲线在各种激发电流下互相交叉，体现了过渡的量子临界行为。过渡曲线的斜率遵循激发电流的幂定律依赖性，给出了缩放指数。结合先前的温度扩展研究的结果，定位长度的关键指数$ν$和相干长度的$ p $分别评估为$ν$ = 2.8 $ \ pm $ \ pm $ 0.3和$ p $ = 3.3 $ \ pm $ 0.3。
We report a current scaling study of a quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator on the surface of a heterostructure film of magnetic topological insulators. The transition was observed by tilting the magnetization while measuring the Hall conductivity $σ_{xy}$. The transition curves of $σ_{xy}$ taken under various excitation currents cross each other at a single point, exemplifying a quantum critical behavior of the transition. The slopes of the transition curves follow a power law dependence of the excitation current, giving a scaling exponent. Combining with the result of the previous temperature scaling study, critical exponents $ν$ for the localization length and $p$ for the coherence length are separately evaluated as $ν$ = 2.8 $\pm$ 0.3 and $p$ = 3.3 $\pm$ 0.3.
