Charge order driven by Fermi-arc instability in Bi$_2$Sr$_{2-x}$La$_{x}$CuO$_{6+\delta}$

Abstract

The understanding of the origin of superconductivity in cuprates has been hindered by the apparent diversity of intertwining electronic orders in these materials. We combined resonant x ray scattering REXS , scanning tunneling microscopy STM , and angle resolved photoemission spectroscopy ARPES to observe a charge order that appears consistently in surface and bulk, and in momentum and real space within one cuprate family, Bi2Sr2 amp; 8722;xLaxCuO6 d. The observed wave vectors rule out simple antinodal nesting in the single particle limit but match well with a phenomenological model of a many body instability of the Fermi arcs. Combined with earlier observations of electronic order in other cuprate families, these findings suggest the existence of a generic charge ordered state in underdoped cuprates and uncover its intimate connection to the pseudogap regime