Electron-hole asymmetry is the key to superconductivity

TL;DR

This paper highlights the fundamental role of electron-hole asymmetry in superconductivity, showing that normal state transport is dominated by dressed holes while supercurrent is carried by undressed electrons, supporting the hole superconductivity theory.

Contribution

It emphasizes the importance of electron-hole asymmetry in superconductivity and provides experimental evidence supporting the theory of hole superconductivity.

Findings

Normal state transport is dominated by dressed positive holes.

Supercurrent is carried by undressed negative electrons.

Electron-hole asymmetry is fundamental to superconductivity.

Abstract

In a solid, transport of electricity can occur via negative electrons or via positive holes. In the normal state of superconducting materials experiments show that transport is usually dominated by $dressed$ $positive$ $hole$ $carriers$. Instead, in the superconducting state experiments show that the supercurrent is always carried by $undressed$ $negative$ $electron$ $carriers$. These experimental facts indicate that electron-hole asymmetry plays a fundamental role in superconductivity, as proposed by the theory of hole superconductivity.