Measuring the Debye energy in superconductors via two-electron photoemission spectroscopy
Ka Ho Wong, Jack Zwettler, Henry Amir, Peter Abbamonte, Fahad Mahmood, Dirk K. Morr
DOI 10.1103/pxm2-rvpw · Physical Review B
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Abstract
We demonstrate theoretically that double angle resolved photoemission spectroscopy (2eARPES) can directly probe the existence of Cooper pairs away from the Fermi surface, and can thus provide insight into the characteristic energy scale around the Fermi surface, the Debye energy, in which electrons are bound into Cooper pairs. To this end, we compute the photoelectron counting rate P(2) in two different types of unconventional superconductors, a dx2−y2-wave superconductor, and a topological superconductor with a broken time-reversal symmetry. We show that P(2) provides insight into the relative strength of intra- and interband pairing in multiband systems, as well as into the spin polarization of the bands.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSexTe1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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