Conservation of the particle-hole symmetry in the pseudogap state in optimally-doped Bi2Sr2CuO6+{\delta} superconductor

TL;DR

This study uses high-resolution photoemission to show that particle-hole symmetry remains conserved in both the pseudogap and superconducting states of an optimally-doped cuprate superconductor, shedding light on the pseudogap's nature.

Contribution

It provides direct experimental evidence that particle-hole symmetry is preserved across the pseudogap transition in a high-temperature superconductor.

Findings

Particle-hole symmetry is conserved in the pseudogap state.

Symmetry conservation is observed along the entire Fermi surface.

Results offer insights into the pseudogap's relation to superconductivity.

Abstract

The pseudogap state is one of the most enigmatic characteristics in the anomalous normal state properties of the high temperature cuprate superconductors. A central issue is to reveal whether there is a symmetry breaking and which symmetries are broken across the pseudogap transition. By performing high resolution laser-based angle-resolved photoemission measurements on the optimally-doped Bi2Sr1.6La0.4CuO6+{\delta} superconductor, we report the observations of the particle-hole symmetry conservation in both the superconducting state and the pseudogap state along the entire Fermi surface. These results provide key insights in understanding the nature of the pseudogap and its relation with high temperature superconductivity.