%0 Journal Article
%T The enigma of the pseudogap phase of the cuprate superconductors
%A Debanjan Chowdhury
%A Subir Sachdev
%J Physics
%D 2014
%I arXiv
%R 10.1142/9789814704090_0001
%X The last few years have seen significant experimental progress in characterizing the copper-based hole-doped high temperature superconductors in the regime of low hole density, p. Quantum oscillations, NMR, X-ray, and STM experiments have shed much light on the nature of the ordering at low temperatures. We review evidence that the order parameter in the non-Lanthanum-based cuprates is a d-form factor density-wave. This novel order acts as an unexpected window into the electronic structure of the pseudogap phase at higher temperatures in zero field: we argue in favor of a `fractionalized Fermi liquid' (FL*) with 4 pockets of spin S=1/2, charge +e fermions enclosing an area specified by p.
%U http://arxiv.org/abs/1501.00002v1