Charge transport properties in a novel holographic quantum phase transition model

TL;DR

This paper explores charge transport in a new holographic quantum phase transition model, revealing distinct coherent and incoherent metallic phases with specific low-temperature transport behaviors.

Contribution

It introduces a novel holographic QPT model with two metallic phases and analyzes their charge transport properties both numerically and analytically.

Findings

Normal metallic phase is coherent.

Novel metallic phase is incoherent with intrinsic conductivity.

Incoherent behavior intensifies with increased momentum dissipation.

Abstract

We investigate the features of charge transport in a novel holographic quantum phase transition (QPT) model with two metallic phases: normal metallic and novel metallic. The scaling behaviors of direct current (DC) resistivity and thermal conductivity at low temperatures in both metallic phases are numerically computed. The numerical results and the analytical ones governed by the near horizon geometry agree perfectly. Then, the features of low-frequency alternating current (AC) electric conductivity are systematically investigated. A remarkable characteristic is that the normal metallic phase is a coherent system, whereas the novel metallic phase is an incoherent system with non-vanishing intrinsic conductivity. Especially, in the novel metallic phase, the incoherent behavior becomes stronger when the strength of the momentum dissipation enhances.