Angle-Resolved Pair Photoemission Theory for Correlated Electrons

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.

10 pages, 4 figures

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• Coincidence detection techniques for direct measurement of many-body correlations in strongly correlated electron systems
• Dynamics of superconducting pairs in the two-dimensional Hubbard model
• Fingerprints of preformed pairs in two-electron angle-resolved photoemission spectroscopy
• Accelerating Resonant Spectroscopy Simulations Using Multi-Shifted Bi-Conjugate Gradient