Quantized Zero-bias Conductance in Thin InAs-Al Nanowires

InAs-Al hybrid nanowires are one of the primary contenders in the search for Majorana zero modes (MZMs). One key prediction of MZM theory is a quantized zero bias peak (ZBP) at 2e² /h in tunneling conductance. Here, we report plateau regions for ZBPs within 5 percent of 2e² /h by sweeping gate voltages and magnetic field in a four-terminal thin InAs-Al device. In another device with a larger barrier transmission, we observe a continuous zero-bias peak-to-dip transition near 2e² /h driven by magnetic field. We further discuss their possible connections to MZMs or other alternative explanations, and also outline our future plans. Our results extensively explore the zero-bias conductance of thin InAs-Al nanowires, constituting a step forward towards establishing Majorana zero modes.