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The atomically clean surface of the iron-based superconductor FeTe0.55Se0.45is investigated by low-temperature STM with different tip apex states. Bymanipulating a single Fe atom onto the tip apex, signatures of the orbitalnature of the subsurface Fe layer of FeTe0.55Se0.45 can be identified. Bypreparing a charged tip state, the intrinsic spatial inhomogeneity of thechemical potential of FeTe0.55Se0.45 can be revealed. As a result, threedifferent types of vortex bound states originating from locally varyingtopological properties of the FeTe0.55Se0.45 surface are observed by scanningtunneling spectroscopy.

Surface orbital order and chemical potential inhomogeneity of the iron-based superconductor FeTe0.55Se0.45 investigated with special STM tips