Distinguishing finite-momentum superconducting pairing states with two-electron photoemission spectroscopy
Distinguishing finite-momentum superconducting pairing states with two-electron photoemission spectroscopy
We show theoretically that double photoemission ($2e$-ARPES) may be used to identify the pairing state in superconductors in which the Cooper pairs have a nonzero center-of-mass momentum, ${\mathbf{q}}_{\mathrm{cm}}$. We theoretically evaluate the $2e$-ARPES counting rate ${P}^{(2)}$ for the cases of a ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$-wave superconductor, a pair-density-wave (PDW) phase, and a Fulde-Ferrel-Larkin-Ovchinnikov …