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

Fahad Mahmood, Thomas Devereaux, Peter Abbamonte, Dirk K. Morr

Research output: Contribution to journalArticlepeer-review


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, qcm. We theoretically evaluate the 2e-ARPES counting rate P(2) for the cases of a dx2-y2-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 2e-ARPES as an ideal tool for identifying and probing qcm≠0 superconducting pairing states in superconductors.

Original languageEnglish (US)
Article number064515
JournalPhysical Review B
Issue number6
StatePublished - Feb 1 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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