【时  间】2025年12月04日 （星期四）14：00

【地  点】量子院526报告厅

【主  持】王积银副研究员  半导体自旋与拓扑量子计算团队

【题  目】Non-Abelian Braiding and Transport Properties of Dirac Fermionic Modes: A Non-Superconducting Analogue of Majorana Zero Modes

【摘  要】Majorana zero modes are among the most extensively studied non-Abelian anyons. Dirac fermionic modes in topological insulators, such as Jackiw-Rebbi zero modes in the Su-Schrieffer-Heeger (SSH) chain, can be viewed as Majorana multiplets protected by a unitary symmetry. Accordingly, Dirac fermionic modes provide an alternative platform for exploring non-Abelian anyons in non-superconducting system. In this talk, I will first introduce the theoretical framework that describes Dirac fermionic modes as non-Abelian anyons. I will then present our two recent works: (i) using a Y-shaped junction constructed from a minimal Kitaev chain, we develop a unified model that captures the non-Abelian braiding properties of both Dirac fermionic modes and Majorana zero modes. This model is closely connected to recent experimental advances in minimal Kitaev chains realized in coupled quantum dot systems [Nature 614, 445 (2023); Nature 641, 890 (2025)]; (ii) we show that the braiding properties of Dirac fermionic modes can be inferred from measurements of their shot-noise signatures in electronic transport.

【报告人简介】吴宜家，复旦大学理论物理与信息科学交叉中心（筹）青年研究员。2015年、2020年分别在浙江大学、北京大学获学士和博士学位。2020-2022年在北京大学量子材料科学中心从事博士后研究，2023年1月加入复旦大学。主要研究领域包括非阿贝尔任意子、拓扑态、量子输运、分数量子霍尔效应等。