Comment on "Magnetotransport signatures of a single nodal electron pocket constructed from Fermi arcs"

TL;DR

This paper critically examines a recent model proposing a single nodal electron pocket to explain Hall coefficient phenomena in cuprates, arguing that multiple pockets are necessary for accurate explanation.

Contribution

It challenges the sufficiency of a single-pocket model, emphasizing the need for multiple pockets with different scattering rates to explain experimental observations.

Findings

Single-pocket model's sign reversal depends on non-generic vertex rounding.

Quantum oscillations in Hall coefficient are unconvincing in the single-pocket model.

Multiple pockets with different scattering rates are required for accurate explanation.

Abstract

We comment on the recent work [N. Harrison, \textit{et al.} Phys. Rev. B {\bf 92}, 224505 (2015)] which attempts to explain the sign reversal and quantum oscillations of the Hall coefficient observed in cuprates from a single nodal diamond-shaped electron pocket with concave arc segments. Given the importance of this work, it calls for a closer scrutiny. Their conclusion of sign reversal of the Hall coefficient depends on a non-generic rounding of the sharp vertices. Moreover, their demonstration of quantum oscillation in the Hall coefficient from a single pocket is unconvincing. We maintain that at least two pockets with different scattering rates is necessary to explain the observed quantum oscillations of the Hall coefficient.