{"id":866688,"date":"2022-08-09T08:07:38","date_gmt":"2022-08-09T15:07:38","guid":{"rendered":"https:\/\/www.microsoft.com\/en-us\/research\/"},"modified":"2022-08-09T08:07:38","modified_gmt":"2022-08-09T15:07:38","slug":"inas-al-hybrid-devices-passing-the-topological-gap-protocol","status":"publish","type":"msr-research-item","link":"https:\/\/www.microsoft.com\/en-us\/research\/publication\/inas-al-hybrid-devices-passing-the-topological-gap-protocol\/","title":{"rendered":"InAs-Al Hybrid Devices Passing the Topological Gap Protocol"},"content":{"rendered":"

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 (opens in new tab)<\/span><\/a>]. 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 20-30<\/span><\/span>\u03bc<\/span><\/span><\/span><\/span>e<\/em>V. This demonstration is a prerequisite for experiments involving fusion and braiding of Majorana zero modes.<\/p>\n

[Long author list, et al.]<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

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 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