Hidden order revealed in quantum oscillations in cuprate superconductors

TL;DR

This paper investigates the origins of quantum oscillations in underdoped cuprate superconductors, emphasizing the roles of bilayer splitting and incommensurate order within a conventional Fermi surface framework.

Contribution

It demonstrates how bilayer splitting and incommensurate $d$-density wave order can explain features of quantum oscillations without invoking a Mott liquid.

Findings

Bilayer splitting causes splitting of quantum oscillation frequencies.

Incommensurate $d$-density wave order influences oscillation behavior.

Results support a Fermi surface-based explanation for observed phenomena.

Abstract

We follow the line of reasoning that hidden broken symmetries are the root of quantum oscillations observed in underdoped superconductors and examine the role of bilayer splitting and incommensuration. This is a view that eschews the notion of a featureless Mott liquid as the source of complexity. Instead, our view is grounded in a conventional Fermi surface and quasiparticles. We show that bilayer splitting and/or incommensurate $d$-density wave order can lead to many interesting results, in particular a splitting of the main frequency of the quantum oscillations.