Fang, Yinan

Yinan Fang obtained his Ph.D. from the Institute of Theoretical Physics, Chinese Academy of Sciences in 2017. After worked as a postdoctoral fellow in the Beijing Computational Science Research Center as well as the McGill University, he joined the Yunnan University in 2021 and became an associated professor since 2023.

His researches focus on the quantum optical effects in the condensed matter systems, with an emphasis on the interplay of collective quantum coherence and the environmental dissipation. His current research focuses on the parity-protected superconducting qubits, randomized quantum circuits, as well as the characterization of correlated noises in spin qubits.

Subgap modes in two-dimensional magnetic Josephson junctions

• Speaker: Fang Yinan (Yunnan University, China)
• Event: Quantum Technology Workshop 2026

Interplay of different orders in mesoscopic magnetic structures near superconducting interfaces can induce rich phenomena ranging from the proximity effect to the topological superconductor. In this talk, we focus on Josephson junctions consisting of two s-wave paired superconductors that interrupted by a ferromagnetic thin layer. In contrast to the usual Josephson junctions where the quasi-particle mainly tunnels through the quasi-1D transport channel, in a 2D junction where the transverse motion of the quasi-particle along the junction interface becomes important, we found a parameter-induced flat-dispersion in subgap modes due to a competition of the proximity effect and the ferromagnetic spin-splitting. This flat quasi-particle dispersion can be utilized for wavefunction switching for multi-domain structures thus opens up potential applications in spintronics.

[1] Yinan Fang, Seungju Han, Stefano Chesi, and Mahn-Soo Choi, Phys. Rev. B 107, 115114 (2023).