The study of electronic nematicity in an overdoped (Bi, Pb)$_2$Sr$_2$CuO$_{6+\delta}$ superconductor using scanning tunneling spectroscopy

TL;DR

This study uses scanning tunneling spectroscopy to investigate electronic nematicity in overdoped (Bi, Pb)$_2$Sr$_2$CuO$_{6+\delta}$, revealing nematic order development near the pseudogap energy scale.

Contribution

It provides new insights into nematic behavior in overdoped cuprates, expanding understanding beyond underdoped samples.

Findings

Nematic order is observed in overdoped (Bi, Pb)$_2$Sr$_2$CuO$_{6+\delta}$.

Nematicity develops as the energy approaches the pseudogap.

Real-space distribution of nematic order is visualized.

Abstract

The pseudogap (PG) state and its related intra-unit-cell symmetry breaking remain the focus in the research of cuprate superconductors. Although the nematicity has been studied in Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$, especially underdoped samples, its behavior in other cuprates and different doping regions is still unclear. Here we apply a scanning tunneling microscope to explore an overdoped (Bi, Pb)$_2$Sr$_2$CuO$_{6+\delta}$ with a large Fermi surface (FS). The establishment of a nematic order and its real-space distribution is visualized as the energy scale approaches the PG.