@misc{nayak2022inas-al,
author = {Nayak, Dr. Chetan and al., et},
title = {InAs-Al Hybrid Devices Passing the Topological Gap Protocol},
howpublished = {arXiv},
year = {2022},
month = {July},
abstract = {We present measurements and simulations of semiconductor-superconductor heterostructure devices that are consistent with the observation of topological superconductivity and Majorana zero modes. The devices are fabricated from high-mobility two-dimensional electron gases in which quasi-one-dimensional wires are defined by electrostatic gates. These devices enable measurements of local and non-local transport properties and have been optimized via extensive simulations for robustness against non-uniformity and disorder. Our main result is that several devices, fabricated according to the design's engineering specifications, have passed the topological gap protocol defined in Pikulin [\it et al.]\ [arXiv:2103.12217]. This protocol is a stringent test composed of a sequence of three-terminal local and non-local transport measurements performed while varying the magnetic field, semiconductor electron density, and junction transparencies. Passing the protocol indicates a high probability of detection of a topological phase hosting Majorana zero modes. Our experimental results are consistent with a quantum phase transition into a topological superconducting phase that extends over several hundred millitesla in magnetic field and several millivolts in gate voltage, corresponding to approximately one hundred micro-electron-volts in Zeeman energy and chemical potential in the semiconducting wire. These regions feature a closing and re-opening of the bulk gap, with simultaneous zero-bias conductance peaks at [\it both] ends of the devices that withstand changes in the junction transparencies. The measured maximum topological gaps in our devices are 20-30μeV. This demonstration is a prerequisite for experiments involving fusion and braiding of Majorana zero modes.

[Long author list, et al.]},
url = {http://approjects.co.za/?big=en-us/research/publication/inas-al-hybrid-devices-passing-the-topological-gap-protocol/},
}