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We extract the density of states (DOS) from the scanning tunnelingspectroscopy data for Ba$_{1-x}$K$_x$Fe$_2$As$_2$ superconductor. The obtainedsample DOS is composed of two ordinary $s$-wave types from the band at $\Gamma$point and a linear-like DOS within the $s$-wave gap from the band at M point inthe Brillouin zone, and is consistent with the corresponding data fromangle-resolved photoemission spectroscopy. We clarify that the major peak ofthe tunneling conductance is not related to the DOS but is rather the effect ofnonequilibrium coherent tunneling including all coherent spins in the tip andsample.

Analyzing scanning tunneling spectroscopy for Fe-based superconductor Ba$_{1-x}$K$_x$Fe$_2$As$_2$ and extracting $s$-wave density of states