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Stripes, spin resonance, and nodeless<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>d</mml:mi></mml:math>-wave pairing symmetry in Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Se<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>-based layered superconductors
We calculate RPA-BCS-based spin resonance spectra of the newly discovered iron-selenide superconductor by using the two-orbital tight-binding model in a 1-Fe-unit cell. The slightly squarish electron pocket Fermi surfaces at $(\ensuremath{\pi},0)/(0,\ensuremath{\pi})$ momenta produce leading interpocket nesting instability at incommensurate vector $q\ensuremath{\sim}(\ensuremath{\pi},0.5\ensuremath{\pi})$ in the normal-state static susceptibility, pinning a strong stripe-like …