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

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

doi:10.1103/PhysRevB.105.064515

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

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

DOI 10.1103/PhysRevB.105.064515 · Physical Review B

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown