Quantized Conductance in InSb nanowires at zero magnetic field

We present measurements of InSb nanowires in the ballistic transport regime. In 1D materials such as nanowires, electron scattering has an increased chance of back-reflection, obscuring the observation of quantized conductance at low magnetic fields. By improving the contacts to the nanowire as well as its dielectric environment backscattering events are minimized and conductance quantization is observable at zero magnetic field with high device yield. We study the evolution of individual sub-bands in an external magnetic field, observing a degeneracy between the 2\textsuperscript{nd} and 3\textsuperscript{rd} sub-band when the magnetic field is orientated perpendicular to the nanowire axis.