Abstract
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.
Highlights
During the last decades, a lot of efforts have been devoted to the functionalization of scanning tunneling microscope (STM) probe tips
By making use of a very sharp tip, the quasiparticle scattering from the point to the X/Y point can be visualized much more clearly compared to a normal tip
The spatial variations of the chemical potential offer an explanation for the observation of three types of vortices hosting different kinds of vortex bound states, namely, topologically trivial Caroli–de Gennes–Matricon bound states (CBSs) or topologically nontrivial Majorana bound states (MBSs)
Summary
A lot of efforts have been devoted to the functionalization of scanning tunneling microscope (STM) probe tips. By picking up a single Fe atom from the sample surface to the tip apex, we have successfully observed a type of order on
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