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Bogoliubov Fermi surfaces of superconducting states arise from point or linenodes by breaking time-reversal symmetry. Because line and point nodes oftenaccompany topologically protected zero-energy surface Andreev bound states(ASBSs) and thereby lead to a characteristic zero-bias conductance peak (ZBCP)in tunneling spectroscopy, we investigate how these properties change when theline and point nodes deform into BFSs. In this paper, we consider spin-quintet$J_{\rm pair}=2$ pairing states of spin-3/2 electrons with BFSs and calculatethe surface density of states and the charge conductance. Comparing theobtained results with the cases of spin-singlet $d$-wave pairing states havingthe same symmetry, we find that the ZBCP associated with point and/or linenodes is blunted or split in accordance with the appearance of the BFSs. On theother hand, when the spin-singlet $d$-wave state has point nodes but does nothave SABS on the surface, we obtain a nonzero small electron conductivity atzero bias through the zero-energy states on the BFSs.

Surface density of states and tunneling spectroscopy of a spin-3/2 superconductor with Bogoliubov Fermi Surfaces