Mechanism for Negative Differential Conductivity in Holographic Conductors

TL;DR

This paper investigates the underlying mechanism of negative differential conductivity in holographic conductors, revealing that increased electric fields extend bound state lifetimes, suppressing ionization and leading to this phenomenon.

Contribution

It provides a novel explanation for negative differential conductivity in holographic models by linking it to bound state lifetime dynamics.

Findings

Bound state lifetimes increase with electric field in negative differential conductivity regimes.

Suppression of ionization of bound states underlies the phenomenon.

Holographic conductors reproduce key features of strongly correlated insulators.

Abstract

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.