The superconducting gap in FeSe/STO films peaks at a magic tetrahedral angle near 107 degrees, where correlation-enhanced A1g electron-phonon coupling is also strongest.
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Correlation Enhanced Electron-Phonon Coupling in FeSe/SrTiO$_3$ at a Magic Angle
The superconducting gap in FeSe/STO films peaks at a magic tetrahedral angle near 107 degrees, where correlation-enhanced A1g electron-phonon coupling is also strongest.