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Single unit cell films of iron selenide (1UC FeSe) grown on SrTiO3 (STO)substrates have recently shown superconducting energy gaps opening attemperatures close to the boiling point of liquid nitrogen (77 K), a record foriron-based superconductors. Towards understanding why Cooper pairs form at suchhigh temperatures, a primary question to address is the role, if any, of theSTO substrate. Here, we report high resolution angle resolved photoemissionspectroscopy (ARPES) results which reveal an unexpected and uniquecharacteristic of the 1UC FeSe/STO system: shake-off bands suggesting thepresence of bosonic modes, most likely oxygen optical phonons in STO, whichcouple to the FeSe electrons with only small momentum transfer. Such couplinghas the unusual benefit of helping superconductivity in most channels,including those mediated by spin fluctuations. Our calculations suggest suchcoupling is responsible for raising the superconducting gap opening temperaturein 1UC FeSe/STO. This discovery suggests a pathway to engineer high temperaturesuperconductors.

Interfacial mode coupling as the origin of the enhancement of Tc in FeSe films on SrTiO3