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

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arxiv 2104.07418 v1 pith:H4SL6D5Y submitted 2021-04-15 cond-mat.supr-con

Dongfei Wang , Ruidan Zhong , Genda Gu , Roland Wiesendanger This is my paper
classification cond-mat.supr-con
keywords fete0surfaceapexchemicaldifferentinhomogeneityinvestigatediron-based
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The atomically clean surface of the iron-based superconductor FeTe0.55Se0.45 is investigated by low-temperature STM with different tip apex states. By manipulating a single Fe atom onto the tip apex, signatures of the orbital nature of the subsurface Fe layer of FeTe0.55Se0.45 can be identified. By preparing a charged tip state, the intrinsic spatial inhomogeneity of the chemical potential of FeTe0.55Se0.45 can be revealed. As a result, three different types of vortex bound states originating from locally varying topological properties of the FeTe0.55Se0.45 surface are observed by scanning tunneling spectroscopy.

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