Recently, Professor Hu Guichao's research group from the School of Physics and Electronic Science of Shandong Normal University published an academic paper entitled "Role of breathers in the organic spin Hall effect" in the internationally renowned journal Physical Review B in the field of physics. Shandong Normal University is the first signatory of the paper, the graduate Prince is the first author, and the corresponding author is Professor Hu Guichao.

Spin Hall effect, which can realize the conversion between current and spin flow, is the frontier research field of spintronics in condensed matter physics. Exploring the spin Hall effect in organic materials and revealing the role of the unique structural properties of organic materials in the spin Hall effect not only has application prospects in the design of flexible devices, but also has important theoretical significance. In recent years, Professor Hu Guichao's research group has developed a set of dynamic methods to simulate polaron transport in two-dimensional organic spin-orbit coupled systems, revealed the oscillatory spin Hall effect in organic polymer systems under polaron transport, and proposed for the first time the physical mechanism that electroacoustic coupled lattice distortion can greatly enhance electron oblique scattering in organic systems. It provides an effective way to overcome the bottleneck caused by weak organic spin orbit coupling [Phys. Rev. B 106, 144309 (2022); Phys. Chem. Chem. Phys. 25, 7763 (2023); Phys. Rev. B 109, 014314 (2024).

However, the details of oblique scattering of organic lattice distortion are still not fully understood, especially in the polaron dynamics process. The lattice distortion includes not only the polaron lattice distortion caused by electric charge, but also the respiron lattice distortion caused by excess energy of electric field. The respective roles of these two lattice distortions in the organic spin Hall effect remain unclear. In this work, by introducing a damping term into the lattice Newton equation, the author realizes the effective regulation of the respirator amplitude. By studying the variation of spin hall effect with the amplitude of the respirator, it is found that the contribution of the respirator to the spin Hall effect is up to 73%, and depends on the strength of interchain coupling. The authors further propose that the organic spin Hall effect can be enhanced by modulating the respiron amplitude by controlling the electric field intensity and polymer chain length. This work not only deepened the understanding of the microscopic mechanism of the organic spin Hall effect, but also provided a potential effective way to design and improve the organic spin Hall effect.

The research was supported by the National Natural Science Foundation.

The thesis links: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.109.224314