Two-component energy spectrum of cuprates in the pseudogap phase and its evolution with temperature and at charge ordering

TL;DR

This paper reveals that in underdoped cuprates, the pseudogap phase's electronic spectrum comprises Fermi arcs and a persistent electronic pocket, clarifying the Hall coefficient behavior and its evolution with doping and temperature.

Contribution

It demonstrates that the electronic spectrum in the pseudogap phase includes a stable electronic pocket and Fermi arcs, challenging the view of Fermi surface reconstruction via charge ordering.

Findings

The electronic spectrum has holes on Fermi arcs and a persistent electronic pocket.

The Hall coefficient's sign is explained by the dominance of electronic contribution at certain doping levels.

Mobility of the electronic component remains temperature independent, unlike holes affected by charge density waves.

Abstract

In the search for mechanisms of high-temperature superconductivity it is critical to know the electronic spectrum in the pseudogap phase from which superconductivity evolves. The lack of angle-resolved photoemission data for every cuprate family precludes an agreement as to its structure, doping and temperature dependence and the role of charge ordering. Here we show that, in the entire Fermi-liquid-like regime that is ubiquitous in underdoped cuprates, the spectrum consists of holes on the Fermi arcs and an electronic pocket. We argue that experiments on the Hall coefficient identify the latter as a permanent feature at doped hole concentration x>0.08-0.10, in contrast to the idea of the Fermi surface reconstruction via charge ordering. The longstanding issue of the origin of the negative Hall coefficient in YBCO and Hg1201 at low temperature is resolved: the electronic contribution prevails as mobility of the latter (evaluated by the Dingle temperature) becomes temperature independent, while the mobility of holes scattered by the short-wavelength charge density waves decreases.