学术报告（2025年11月10日10:00）：Torsional Hall Viscosity of Massive Chern Insulators

主持人：叶鹏教授

报告摘要: In this talk I will discuss a non-dissipative, parity-odd transport of (2+1)-dimensional relativistic fermions generated by torsion, namely the torsional Hall viscosity. After introducing the torsional Hall viscosity of massive Dirac fermions, I will discuss two experimentally relevant deformations of this phenomenon. Firstly, in the presence of a constant electromagnetic field, we find that the magnetic field induces a contribution to the torsional Hall viscosity that competes with the one originating from the Dirac mass. Then, we consider the band structure deformation quadratic in momentum terms that was proposed by Bernevig–Hughes–Zhang (BHZ). We find that the BHZ deformation enhances the torsional Hall viscosity in magnitude, but reverses its sign as compared to the standard massive Dirac fermion, indicating a Hall response in opposite direction to the typical Hall viscous force. Nevertheless, the torsional Hall viscosity still discriminates between topologically trivial and nontrivial regimes. These results pave the way for a deeper understanding of the topological response due to torsion and its possible verification in experiments.

个人简历：贾唯真，2017年本科毕业于北京师范大学，2024年博士毕业于美国伊利诺伊大学厄巴纳香槟分校(UIUC)，目前为香港中文大学博士后，研究方向包括高能理论、凝聚态理论和数学物理，主要从事量子场论、全息对偶、量子反常以及拓扑相的相关研究。