杂质对磁滞磁导的影响：全息方法
Impurity Effect on Hysteric Magnetoconductance: Holographic Approach
摘要：
本文利用规范/引力对偶性研究了从弱定域相到磁导相的磁导相变。这个相位是由与动量弛豫的2+1维系统中的Z2对称性和时间反演对称性相关的自发磁化触发的。我们推导出描述非晶相和晶相的热电电导率公式。在低温下，这种磁导表现出类似于拓扑绝缘体表面态的相变。我们还得到了塞贝克系数和能斯特信号的磁滞曲线。结果表明，我们的杂质参数改变的双重系统的磁性。这是合理的，表现出增加的磁化率和自发磁化的杂质参数增加。
英文摘要：
In this paper we study a hysteric phase transition from weak localization phase to hysteric magnetoconductance phase using gauge/gravity duality. This hysteric phase is triggered by a spontaneous magnetization related to Z2 symmetry and time reversal symmetry in a 2+1 dimensional system with momentum relaxation. We derive thermoelectric conductivity formulas describing non-hysteric and hysteric phases. At low temperatures, this magneto-conductance shows similar phase transitions of topological insulator surface states. We also obtain hysteresis curves of Seebeck coefficient and Nernst signal. It turns out that our impurity parameter changes magnetic properties of the dual system. This is justified by showing increasing susceptibility and the spontaneous magnetization with increasing impurity parameter.
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