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One of the simplest proposed experimental probes of a Majorana bound-state isa quantized (2e^2/h) value of zero-bias tunneling conductance. When temperatureis somewhat larger than the intrinsic width of the Majorana peak, conductanceis no longer quantized, but a zero-bias peak can remain. Such a non-quantizedzero-bias peak has been recently reported for semiconducting nanowires withproximity induced superconductivity. In this paper we analyze the relation ofthe zero-bias peak to the presence of Majorana end-states, by simulating thetunneling conductance for multi-band wires with realistic amounts of disorder.We show that this system generically exhibits a (non-quantized) zero-bias peakeven when the wire is topologically trivial and does not possess Majoranaend-states. We make comparisons to recent experiments, and discuss thenecessary requirements for confirming the existence of a Majorana state.

Zero-bias peaks in spin-orbit coupled superconducting wires with and without Majorana end-states