Distinguishing finite momentum superconducting pairing states with two-electron photoemission spectroscopy

Abstract

We show theoretically that double photoemission (2$e$-ARPES) may be used to identify the pairing state in superconductors in which the Cooper pairs have a nonzero center-of-mass momentum, ${\mathbf{q}}_{cm}$. We theoretically evaluate the 2$e$ ARPES counting rate, $P^{(2)}$, for the cases of a $d_{x^2-y^2}$-wave superconductor, a pair-density-wave (PDW) phase, and a Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) phase. We show that $P^{(2)}$ provides direct insight into the center-of-mass momentum and spin state of the superconducting condensate, and thus can distinguish between these three different superconducting pairing states. In addition, $P^{(2)}$ can be used to map out the momentum dependence of the superconducting order parameter. Our results identify 2$e$-ARPES as an ideal tool for identifying and probing ${\mathbf{q}}_{cm}\ne 0$ superconducting pairing states in superconductors.

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• Scattering theory of mesons in doped antiferromagnetic Mott insulators: Multichannel perspective and Feshbach resonance
• Dynamic charge order from strong correlations in the cuprates
• Coincidence detection probability of $(\gamma ,2e)$ photoemission measurement
• Accelerating Resonant Spectroscopy Simulations Using Multi-Shifted Bi-Conjugate Gradient
• Coincidence detection techniques for direct measurement of many-body correlations in strongly correlated electron systems
• Fingerprints of preformed pairs in two-electron angle-resolved photoemission spectroscopy