Resistivity anisotropy from the multiorbital Boltzmann equation in nematic FeSe

TL;DR

This study models resistivity anisotropy in nematic FeSe using a multiorbital Boltzmann approach, revealing the significant impact of impurity scattering and nematic order types on electronic transport properties.

Contribution

It introduces a multiorbital Boltzmann framework that incorporates impurity effects and multiple nematic orders to explain resistivity anisotropy in FeSe.

Findings

Impurity scattering causes anisotropic renormalization of electronic velocities.

The $xy$ nematic order is crucial to match experimental anisotropy data.

Different nematic scenarios leave distinct signatures on transport properties.

Abstract

We compute the resistivity anisotropy in the nematic phase of FeSe from the static solution of the multiorbital Boltzmann equation. By introducing disorder at the level of the microscopic multiorbital model we show that even elastic scattering by localized impurities may lead to non-trivial anisotropic renormalization of the electronic velocities, challenging the usual understanding of transport based only on cold- and hot-spots effects. Our model takes into account both the $xz/yz$ and the recently proposed $xy$ nematic ordering. We show that the latter one has a crucial role in order to reproduce the experimentally-measured anisotropy, providing a direct fingerprint of the different nematic scenarios on the bulk transport property of FeSe.