Angle-Resolved Pair Photoemission Theory for Correlated Electrons

TL;DR

This paper proposes a novel theoretical framework for pair photoemission, enabling high-resolution detection of correlated electron pairs emitted by two incident photons, which could advance the study of electronic correlations.

Contribution

It introduces a new angle-resolved pair photoemission theory that differs from double photoemission, allowing for better measurement of electronic correlations without energy penalties.

Findings

Pair photoemission can occur without the energy penalty of two work functions.

The theory allows detection of correlated electron pairs at high energy resolution.

It expands the understanding of electron emission processes in correlated materials.

Abstract

In this paper we consider the possibility and conditions for pair photoemission whereby two incident photons emit pairs of electrons from a candidate material as a novel method to measure and visualize electronic correlations. As opposed to double photoemission - where a single photon precipitates the ejection of a pair electrons via a subsequent electron energy loss scattering process - we show that pair photoemission need not be limited to interference between initial photoelectrons and valence electrons, and moreover, can occur without the energy penalty of two work functions. This enables detection of pairs of electrons at high energy resolution that may be correlated in the same quantum many-body states.