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We show that a topologically trivial zero bias conductance peak (of height4e^2/h) is produced in semiconductor-superconductor hybrid nanowires due to asuppressed pair potential and/or an excess Zeeman field at the ends of theheterostructure, both of which can occur in experiments. The zero bias peak(ZBP) (a) appears above a threshold parallel bulk Zeeman field, (b) is stablefor a range of bulk field before splitting, (c) disappears with rotation of thebulk Zeeman field, and, (d) is robust to weak disorder fluctuations. The ZBPsfrom the nanowire ends are also expected to produce splitting oscillations withthe applied field similar to those from Majorana fermions. We find that theonly unambiguous way to distinguish these trivial ZBPs (of height 4e^2/h) fromthose arising from Majorana fermions (of height 2e^2/h) is by comparing the(zero temperature) peak height and/or through an interference experiment.

Topologically trivial zero bias conductance peak in semiconductor Majorana wires from boundary effects