As a high-quality hybrid system, InSb nanowires with epitaxial-grown Al shells reveal ballistic superconductivity and quantized zero-bias conductance peak. This holds great promise for the realization of Majorana-based topological quantum computing. The building block for a topological qubit is a superconductor-semiconductor island hosting a pair of Majorana zero modes (called Majorana island). The state of the topological qubit is the combination of the even/odd parity of such Majorana islands. Therefore, to understand the status of the topological qubit, systematic studies of a Majorana island are crucial. First, by performing tunnelling spectroscopy measurements, we use the ballistic superconductivity and quantized zero-bias peak to support the high-quality and potential `Majorana' properties of the island. Secondly, the even-odd ground state phase diagram as a function of chemical potential is mapped out and provides a guideline for the topological qubit. Thirdly, how the superconducting gap and effective g-factor influence the phase diagram is also studied. Such a systematic mapping of the Majorana island is also suitable for double islands, leading towards topological qubits based on multiple islands.Dutch Organization for Scientific Research and Microsoft Corp. Station Q.
APS March Meeting Abstracts
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