Nonlinear conductivity of a holographic superconductor under constant electric field
Nonlinear conductivity of a holographic superconductor under constant electric field
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恒定电场下全息超导体的非线性电导率
DOI：
10.1103/physrevd.95.046014
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发表时间：
2017
影响因子：
5
通讯作者：
Chen Chiang-Mei
中科院分区：
文献类型：
--
作者：
Zeng Hua Bi;Tian Yu;Fan Zheyong;Chen Chiang-Mei
利用规范/引力对应研究了二维超导体在恒定电场E下的动力学行为。由E引起的对断开电流先增加到一个峰值，然后在超导能隙为零时减小到一个恒定值，对应于正常导通阶段。电流的峰值被发现相对于电场线性增加。此外，非线性电导率，定义为在超导相的电导率的平均值，规模为$\sim E^{-2/3}$为大$E$时，系统是接近临界温度，这与预测从解决时间依赖的金斯堡-朗道方程。
The dynamics of a two-dimensional superconductor under a constant electric field $E$ is studied by using the gauge/gravity correspondence. The pair breaking current induced by $E$ first increases to a peak value and then decreases to a constant value at late time, where the superconducting gap goes to zero, corresponding to a normal conducting phase. The peak value of the current is found to increase linearly with respect to the electric field. Moreover, the nonlinear conductivity, defined as an average of the conductivity in the superconducting phase, scales as $\sim E^{-2/3}$ for large $E$ when the system is close to the critical temperature, which agrees with predictions from solving the time dependent Ginzburg-Landau equation.