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In recent times, Bogoliubov Fermi surfaces (BFSs) in superconductors (SCs)have drawn significant attention due to a substantial population of Bogoliubovquasiparticles (BQPs) together with Cooper pairs (CPs) in them. The BQPs aszero energy excitations give rise to captivating and intricate charge dynamicswithin the BFSs. In this theoretical study, we propose to reveal the uniquesignatures of the topologically protected BFSs in a normal metal/time-reversalsymmetry (TRS) broken $d$-wave SC, in terms of the differential conductance andFano factor (FF). For an isotropic $d$-wave SC, an enhancement in zero-biasconductance (ZBC) can be identified as a key signature of BFSs. However, forthe anisotropic SC, this feature does not replicate due to the presence of thelocalized Andreev bound state (ABS) at the interface. The interplay of ABS andBFSs gives rise to an anomalous behavior in ZBC. We explain this anomalousbehavior by analyzing the effective charge of the carriers in terms of the FF.The simplicity of our setup based on $d$-wave SC makes our proposal persuasive.

Transport signatures of Bogoliubov Fermi surfaces in normal metal/time-reversal symmetry broken $d$-wave superconductor junctions