论文标题
全息导体负差分电导率的机制
Mechanism for Negative Differential Conductivity in Holographic Conductors
论文作者
论文摘要
我们阐明了全息导体中负差分电导率的机制。负差分电导率是一种现象，其中电场随电流的增加而破坏。这种现象在密切相关的绝缘子中广泛观察到，众所周知，某些ADS/CFT对应关系（全息电导率）的模型会重现这种行为。我们通过分析电荷载体结合状态的寿命来研究全息导体中负差分电导率的机制。我们发现，当该系统表现出负差分电导率时，随着电场的增加，结合状态的寿命会增长。这表明该系统中的负差分电导率是通过供应自由载体的结合状态的电离来实现的。
We clarify the mechanism for negative differential conductivity in holographic conductors. Negative differential conductivity is a phenomenon in which the electric field decreses with the increase of the current. This phenomenon is widely observed in strongly correlated insulators, and it has been known that some models of AdS/CFT correspondence (holographic conductors) reproduces this behaviour. We study the mechanism for negative differential conductivity in holographic conductors by analyzing the lifetime of the bound states of the charge carriers. We find that when the system exhibits negative differential conductivity, the lifetime of the bound states grows as the electric field increases. This suggests that the negative differential conductivity in this system is realized by the supression of the ionization of the bound states that supplies the free carriers.
