# DMFT study on the electron-hole asymmetry of the electron correlation strength in the high Tc cuprates

## TL;DR

This study uses dynamical mean field theory to explain the electron-hole asymmetry in high-Tc cuprates, showing that differences in correlation effects, not interaction strength, account for the observed phase diagram asymmetry.

## Contribution

It demonstrates that the electron-hole asymmetry in cuprates arises from the visibility of correlation effects rather than differences in Hubbard U.

## Key findings

- Correlation effects are more visible in hole-doped systems.
- Electron-doped systems show weaker correlation visibility.
- The asymmetry is explained without varying interaction strength.

## Abstract

Recent experiments revealed a striking asymmetry in the phase diagram of the high temperature cuprate superconductors. The correlation effect seems strong in the hole-doped systems and weak in the electron-doped systems. On the other hand, a recent theoretical study shows that the interaction strengths (the Hubbard U) are comparable in these systems. Therefore, it is difficult to explain this asymmetry by their interaction strengths. Given this background, we analyze the one-particle spectrum of a single band model of a cuprate superconductor near the Fermi level using the dynamical mean field theory. We find the difference in the "visibility" of the strong correlation effect between the hole- and electron-doped systems. This can explain the electron-hole asymmetry of the correlation strength without introducing the difference in the interaction strength.