Statistical mechanics is one of the main research directions of Yang Zhenning. His characteristic in statistical mechanics is to strictly solve and analyze the general model rooted in physical reality, so as to grasp the essence and essence of the problem. From 65438 to 0952, Yang Zhenning and his collaborators published three important papers on phase transition. The climax of these papers is the unit circle theorem in the second paper, which points out that the zero point of the giant partition function of the lattice gas model attracting interaction lies on the unit circle on the complex plane.

2. Boson many-body problem

Out of his interest in liquid helium superfluid, Yang Zhenning published or completed a series of papers on thin boson multibody systems with his collaborators around 1957.

First, he published two papers with Huang and Luttinger, and applied the pseudopotential method to this field. After writing the article "Is parity conserved in weak interaction", while waiting for the experimental results, the correct ground state energy correction was obtained by double collision method, and then the same results as Huang and Huang were obtained by pseudo potential method.

The most surprising energy correction they got was the famous square root correction term, but it could not be verified by experiments at that time. However, with the development of cold atomic physics, this correction term has been confirmed by experiments.

3. Exact solution of boson in the repulsive potential of 1 dimensional δ function at finite temperature.

In 1969, Yang Zhenning and Yang Zhenping pushed the boson problem in the repulsive potential of 1 dimensional δ function to a finite temperature. This is the first time in history that a quantum statistical model of interaction is obtained at a finite temperature (T >). This model and results were later realized and verified by experiments in the cold atomic system.

4. Theoretical explanation of superconducting magnetic ionization.

196 1 year, through close communication with Fei Zhengqing experimental group, Yang Zhenning and byers theoretically explained the superconducting magnetic ionization discovered by the experimental group, proved that electron pairing can lead to observed phenomena, clarified the basic principle of electromagnetic field without introducing new principles, and corrected the mistakes of London reasoning. In this work, Yang Zhenning and byers applied gauge transformation technique to condensed matter system. Related physics and methods were later widely used in the study of superconductivity, superfluidity and quantum Hall effect.

5. Off-diagonal long program

1962, Yang Zhenning put forward the concept of "long-range order from two angles", thus describing the essence of superfluidity and superconductivity in a unified way, and deeply discussing the root of flux ionization. This is a key concept of contemporary condensed matter physics. From 1989 to 1990, Yang Zhenning found the eigenstate with off-diagonal long program in the Hubbard model closely related to HTS, and found its SO(4) symmetry with Zhang Shousheng.

Extended data:

Thesis:

About 300 articles have been published in magazines such as Physical Review and Physical Review Newsletter.

Works:

Selected Papers and Remarks 1945- 1980 (English), (Freeman Company, 1983)

Collected Works of Yang Zhenning (Chinese), (Shanghai East China Normal University Press, 1998)

Twilight Collection (Chinese), (Simplified Edition, Beijing Sanlian Bookstore; Traditional Edition, Bafang Culture Workshop, 2008)

On May 20 18, Yang Zhenning and his wife Weng Fan published the scientific paper Dawn Collection.

In addition, there are Query on the Conservation of Parity in Weak Interaction, A Brief History of the Discovery of Fundamental Particles, Forty Years of Reading and Teaching, Science, Education and China Modernization, the Character of Science, Science and Technology in the New Century, Physics in the 20th Century, Symmetry and Physics, etc.

Baidu Encyclopedia-Yang Zhenning