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We report an in situ scanning tunneling spectroscopy study of one-unit-cell(1-UC) FeSe film on SrTiO3(001) (STO) substrate. In quasiparticle density ofstates, bosonic excitation mode characterized by the "dip-hump" structure isdetected outside the larger superconducting gap with energy comparable withphonon and spin resonance modes in heavily electron-doped iron selenides.Statistically, the excitation mode, which is intimately correlated withsuperconductivity, shows an anticorrelation with pairing strength and yields anenergy scale upper-bounded by twice the superconducting gap coinciding with thecharacteristics of magnetic resonance in cuprates and iron-basedsuperconductors. The local response of tunneling spectra to magneticallydifferent Se defects all exhibits the induced in-gap quasiparticle boundstates, indicating an unconventional sign-reversing pairing. These resultssupport the magnetic nature of the excitation mode and possibly reveal asignature of electron-magnetic-excitation coupling in high-temperaturesuperconductivity of 1-UC FeSe/STO.

Detection of bosonic mode as a signature of magnetic excitation in one unit cell FeSe on SrTiO3