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首页> 外文期刊>new journal of physics >Two distinctive regimes in the charge transport of a magnetic topological ultra thin film
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Two distinctive regimes in the charge transport of a magnetic topological ultra thin film

机译：磁性拓扑超薄膜电荷传输中的两种不同状态

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摘要

The effect of the magnetic impurities on the charge transport in a magnetic topological ultra-thin film (MTF) is analytically investigated by applying the semi-classical Boltzmann framework through a modified relaxation-time approximation. Our results for the relaxation time of electrons as well as the charge conductivity of the system exhibit two distinct regimes of transport. We show that the generated charge current in a MTF is always dissipative and anisotropic when both conduction bands are involved in the charge transport. The magnetic impurities induce a chirality selection rule for the transitions of electrons which can be altered by changing the orientation of the magnetic impurities. On the other hand, when a single conduction band participates in the charge transport, the resistivity is isotropic and can be entirely suppressed due to the corresponding chirality selection rule. Our findings propose a method to determine an onset thickness at which a crossover from a three-dimensional magnetic topological insulator to a (two-dimensional) MTF occurs.
机译：通过改进的弛豫时间近似应用半经典玻尔兹曼框架，分析研究了磁性杂质对磁性拓扑超薄膜（MTF）中电荷传输的影响。我们对电子弛豫时间和系统电荷电导率的结果表现出两种不同的传输方式。我们表明，当两个导带都参与电荷传输时，MTF中产生的电荷电流始终是耗散的和各向异性的。磁性杂质为电子跃迁诱导了手性选择规则，可以通过改变磁性杂质的方向来改变该规则。另一方面，当单个导带参与电荷传输时，电阻率是各向同性的，并且由于相应的手性选择规则，可以完全抑制。我们的研究结果提出了一种方法来确定从三维磁拓扑绝缘体到（二维）MTF发生交叉的起始厚度。

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