报告题目：Quantum Mechanics of Open Systems: A Statistical Quasiparticles Theory

报告时间：2021 年 4 月 29 日（周四）10 : 00 - 11 : 00

报告地点：北洋园校区理学院 32 教 218 室

报告摘要：

After a general background on the theories of open quantum systems, I will present the Dissipaton Equation of Motion (DEOM) theory [1], developed in my group since 2014. Physically, dissipatons are statistical quasi-particles that describe the influences of Gaussian hybrid environments. The underlying dissipaton algebra includes especially the generalized Wick's theorem for both hybridization coordinates [1,2] and conjugated momentums [3]. This generalizes and enriches the existing exact and nonperturbative approaches, such as the numerical  renormalization group method, the Feynman-Vernon path-integral influence functional formalism and its time-derivative equivalence. The DEOM theory enables accurate evaluations on strongly correlated impurities systems, covering from thermodynamics to quantum transport and quantum noise problems. I will also present some all-first-principles studies on realist single-molecular spintronic systems, which combine the DEOM dynamics and the conventional electronic structural determinations [4].

报告人简介：

严以京，教授，1982年于复旦大学化学系获学士学位，1989年美国罗彻斯特大学化学系获博士学位, 1989年至1992年先后在罗彻斯特大学化学系和加州大学圣地亚哥分校化学系作博士后研究，1992年至1994年加州大学圣地亚哥分校非线性科学研究所任研究型副教授。1994年起历任香港科技大学化学系助理教授，副教授，教授。2010年至今，任中国科学技术大学化学物理系和合肥微尺度物质科学国家研究中心教授，博士生导师。 

严以京教授是 American Physical Society Fellow，中国科学院海外杰出科学家，国家自然科学基金委海外杰出青年科学家。 曾任Journal of Chemical Physics 编委， Physical Review A 等杂志审稿人。

参考文献：

[1] Y. J. Yan, J. Chem. Phys. 140, 054105 (2014);     Y. J. Yan, J. S. Jin, R. X. Xu, and X. Zheng, Front. Phys. 11, 110306 (2016).

[2] J. S. Jin, S. K. Wang, X. Zheng, and Y. J. Yan, J. Chem. Phys. 142, 234108 (2015);    H. D. Zhang, R. X. Xu, X. Zheng, and Y. J. Yan, Mol. Phys. 116, 780 (2018).

[3] Y. Wang, R. X. Xu, and Y. J. Yan, J. Chem. Phys. 152, 041102 (2020).

[4] L. Z. Ye, X. L. Wang, D. Hou, R. X. Xu, X. Zheng, and Y. J. Yan, WIREs Comp. Mol. Sci. (2016);     X. L. Wang, D. Hou, X. Zheng, and Y. J. Yan, J. Chem. Phys. 144, 034101 (2016);     X. L. Wang, L. Q. Yang, L. Z. Ye, X. Zheng, and Y. J. Yan, J. Phys. Chem. Letts. 9, 2418 (2018).