Bomin Zhang's Doctoral Defense

May 23, 2023 - 11:00am to 1:00pm

Bomin Zhang's Doctoral Defense advised by Dr. Sergey Frolov

Josephson Current in One-Dimensional InSb-Sn Hybrid Semiconductor-Superconductor Devices

Abstract:  Superconducting and semiconducting materials have been extensively studied as separate topics within the field of condensed matter, significantly contributing to the scientific and technological advancements of the 20th century. The hybrid systems combining these advancements have emerged as the primary focus in mesoscopic physics and quantum technology. While superconducting qubits based on these systems have demonstrated their superiority, topologically protected Majorana qubits hold considerable potential for future fault-tolerant quantum computing.

However, the realization of Majorana zero modes (MZM) requires the elegant balancing of various effects, including spin-orbit interaction, proximity-induced superconductivity, gate tuning, and Zeeman splitting. To reach the topological regime, it is crucial to have a profound understanding of these physics within microscopic devices. Hybrid nanowire systems, due to their geometry, are adept at confining the transport of charge carriers to one-dimensional channels, making them a promising platform for studying these physical effects and realizing MZM. Nevertheless, they are also sensitive to the presence of disorders within the system. My research primarily focuses on the Josephson effect in hybrid nanowire junctions, using DC Josephson current as a tool to study spin-orbital interaction, orbital effects, and disorder within the system.

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Location and Address

321 Allen Hall