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Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.55</mml:mn></mml:mrow></mml:msub></mml:math>Se<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.45</mml:mn></mml:mrow></mml:msub></mml:math>
We used angle-resolved photoemission spectroscopy to reveal directly the momentum distribution of the superconducting gap in FeTe${}_{1\ensuremath{-}x}$Se${}_{x}$, which has the simplest structure of all Fe-based superconductors. We found isotropic superconducting gaps on all Fermi surfaces whose sizes can be fitted by a single gap function derived from a strong coupling …