Allais, AndreaChowdhury, DebanjanSachdev, Subir2015-06-122014Allais, Andrea, Debanjan Chowdhury, and Subir Sachdev. 2014. “Connecting High-Field Quantum Oscillations to Zero-Field Electron Spectral Functions in the Underdoped Cuprates.” Nature Communications 5 (December 10): 5771. doi:10.1038/ncomms6771.2041-1723http://nrs.harvard.edu/urn-3:HUL.InstRepos:16319688The nature of the pseudogap regime of cuprate superconductors at low hole density remains unresolved. It has a number of seemingly distinct experimental signatures: a suppression of the paramagnetic spin susceptibility at high temperatures, low-energy electronic excitations that extend over arcs in the Brillouin zone, X-ray detection of charge-density wave order at intermediate temperatures and quantum oscillations at high magnetic fields and low temperatures. Here we show that a model of competing charge-density wave and superconducting orders provides a unified description of the intermediate and low-temperature regimes. We treat quantum oscillations at high field beyond semiclassical approximations, and find clear and robust signatures of an electron pocket compatible with existing observations; we also predict oscillations due to additional hole pockets. In the zero-field and intermediate temperature regime, we compute the electronic spectrum in the presence of thermally fluctuating charge-density and superconducting orders. Our results are compatible with experimental trends.en-USPhysical sciencesTheoretical physicsCondensed matterJournal Article2015-06-1210.1038/ncomms6771