University Physics Teaching Department

University Physics Experimental Center

Department of Physics

The theoretical physics discipline of Nanjing Normal University began to recruit and train graduate students in 1978, and was granted the right to confer master's degree in 199 and doctor's degree in 23. Since 1996, the discipline of theoretical physics has been successively rated as the key discipline of Jiangsu provincial government in the Ninth Five-Year Plan and the Tenth Five-Year Plan.

since p>21, the construction of key disciplines of theoretical physics in Nanjing Normal University has been running well, and the planned tasks of discipline construction have been fully completed. Important progress or breakthrough has been made in degree program construction, discipline echelon construction, laboratory construction and scientific research, which has made outstanding contributions to the national economic construction and scientific and technological development in Jiangsu Province, mainly in the following aspects:

(1) degree program construction: in 23, I applied for and obtained the right to confer a doctorate in theoretical physics. Relying on theoretical physics, we cultivated new degree programs, declared and obtained two master's degree programs in condensed matter physics, particle physics and nuclear physics in 23, and declared and obtained the master's degree program in physics first-class discipline in 25. An important breakthrough has been made in the construction of degree programs.

(2) Academic echelon construction and personnel training: After years of unremitting efforts, the theoretical physics discipline has a teaching and research team with high academic level, reasonable age structure of professional titles and strong overall scientific research strength. Since 21, eight doctors (later) have become new members of the discipline. At present, there are 23 discipline members, including 1 young and middle-aged expert with outstanding contributions from China, 2 from distinguished professor, 6 doctoral supervisors, 1 master supervisors, and 17 discipline members with doctoral degrees.

Theoretical physics has undertaken a large number of undergraduate and postgraduate training tasks. In undergraduate teaching, combined with the new development of physics, we should expand students' knowledge and work hard to cultivate students' innovative ability. In postgraduate training, we can offer high-level postgraduate courses and special lectures reflecting the latest research trends at home and abroad. Through the careful guidance and strict requirements of the tutor, students can enter the forefront of the subject quickly. When master students graduate, most of them can publish papers in international and national core academic journals. Since 21, there have been more than 6 undergraduates majoring in physics education and 43 postgraduates. There are 63 master students and 9 doctoral students. More than 8% of our graduates work in universities and middle schools in Jiangsu Province, which has made important contributions to the development of our national economy and scientific and technological progress.

(3) Laboratory construction: Since 21, the "Scientific Computing Laboratory" has been upgraded. The computer cluster was increased from 32 nodes to 64 nodes (128 CPUs), two 14-square-meter computer rooms were built, and 7 P-IV microcomputers and high-speed laser printers were added, which improved the computing power by 2~3 orders of magnitude. The discipline has also ordered 2 original English magazines and more than 8 Chinese periodicals, and can download more than 6, academic papers in English periodicals through the Internet. Theoretical physics already has a high-level teaching and research platform.

(4) scientific research: since 21, 16 national climbing plan sub-projects, national "973" sub-projects and national natural science foundation projects have been completed, 14 ministerial, provincial and departmental projects have undertaken 1 national natural science foundation projects, 3 national education Ministry projects and 16 provincial and departmental research projects. The total funding of the research project is 3.38 million yuan. Since 21, 4 academic monographs have been published, and 311 academic papers have been published in major academic journals at home and abroad, such as "Phys. Rev. Lett" and "Phys. Rev. A-E", among which 242 are "SCI" papers, which have been cited by others for more than 8 times.

The main scientific research achievements since p>21 are as follows:

(a) Under the framework of standard model, double Higgs model and minimum supergravity model, Professor Zhenjun Xiao and his collaborators have systematically studied the non-weak decay process and radiation decay process of B meson. The new physical corrections of observable physical quantities such as branch ratio and CP destruction of 115 B meson decay channels are calculated. Under the new physical model, a self-consistent explanation is given for the anomaly of large branching ratio of B →Kη'. According to the latest experimental data, they also took the lead in limiting the phase angle α of CKM. Related papers have been published in important "SCI" academic journals such as "phys.rev.d" and "EUR.phys.j.c", and have been cited by colleagues at home and abroad for more than 8 times.

(b) Professor Ping Galen and his collaborators consider the mixing of various color structures by introducing quark sloughing localization and color shielding. By quantitative calculation, it is concluded that the five quark system can have * * * vibrational states. For NK system, I= channel has equivalent attraction and I=1 channel has strong repulsion. The original experimental analysis is unreliable because of the influence of approximation and error: for θ+of Diquark structure, quantitative calculation shows that the energy of negative parity state is lower, which is different from Jaffe-Wilczek's conclusion; In the model of Pingalen et al., the energy of the five quark system with diamond structure is the closest to the experimental results. Academic papers were published in important "SCI" academic journals such as "Phys.Rev.C" and "nucl.phys.a.".

(c) Professor Tong Peiqing cooperated with Professor Tang Lei-Han of Hong Kong Baptist University and others to study whether the two-dimensional XY model (GAUGE-GLASS model) has a phase transition and a state at low temperature under strong disorder. This is a long-debated problem in the scientific community. By mapping the Vortex in the system to Coulomb gas, through numerical simulation, it is found that the low-energy excited state of the system can be described by the weakly interacting Vortex and Antivortex pairs without gaps. Through the linear dielectric shielding calculation of renormalization group method, it is found that the Stiffness of spin wave decays with the power of distance. Large-scale multi-canonical Monte-Carlo method is used to calculate the low-temperature specific heat and the magnetic susceptibility of spinning glass, and the conclusions are consistent, so it is considered that there is no finite temperature thermodynamic phase transition in the system. The dispute was resolved and the paper was published in "Phys.Rev.Lett".

(d) Professor Chen Lingfu and his collaborators have made a detailed study on the structure, diffusion, decay, absorption or emission spectrum of self-trapping holes and self-trapping excitons in KMgF3 materials. This study has important theoretical significance for improving the performance of KMgF3 materials in scintillation performance, radiation dose, tunable lasers and other applications.

Professor Chen Lingfu, Associate Professor Huang Guiqin and their collaborators also conducted a first-principles study on superconductivity of ternary silicide superconducting materials. The results show that the soft mode in this kind of material plays an important role in the superconductivity of the material, and the calculated superconducting transition temperature is in good agreement with the experimental data after considering the anharmonicity of the soft mode. They made a comprehensive study of the electronic structure, phonon structure and electro-phonon interaction of materials based on first principles, and the method was advanced and reliable. In addition, the study of superconducting silicide materials not only helps to further understand the superconducting mechanism of metal compound superconductors, but also provides a theoretical basis for the application of superconducting silicide in electronic devices in the future. The research papers were published in important "SCI" academic journals such as "phys.rev.b.".

(e) Professor Xu Zhongming and Professor Wu Xuejun have done a lot of research work on cosmic perturbation theory, higher-order gravity theory and relativistic celestial mechanics of general relativity. In cooperation with Dresden University of Science and Technology in Germany, they established the elasticity theory of general relativity with the support of the German National Science Foundation, and established the J-V equation of relativity (that is, the basic equation of relativistic elastic rotating celestial bodies) and its connection conditions. The Newton approximation and non-rotation are consistent with the famous Wahr model in the 198s. The research papers were published in important "SCI" academic journals such as "Phys.Rev. D".

(f) Professor Yuan Qirong cooperated with his colleagues at home and abroad, and used the 6/9cm Schmidt telescope of China National Astronomical Observatory to conduct multicolor photometric observation (BATC) on the nearby galaxy cluster Abell 2255, and obtained more than 7, V <: 2 and other celestial bodies in the optical band (3A－1A). They used aperture correction method to match the photometric data of SDSS with the data of BATC, and obtained the energy spectrum distribution (SEDs) information of 18 bands of these celestial bodies. Firstly, the SEDs of 254 galaxies with known red shift are analyzed, and it is proved that the combined SEDs can obviously improve the accuracy of photometric red shift. The analysis of dynamics (bimodal structure of apparent velocity) of 214 known member galaxies shows that this cluster of galaxies is a dynamic system that has not reached relaxation. They selected 313 new candidate member galaxies by photometric redshift technology, and further dynamic analysis found that there was a dynamic substructure, and found the direct evidence that the cluster of galaxies was undergoing the merger process between subgroups. The research papers were published in important "SCI" academic journals such as "APJS".

(g) Based on the nonlinear interaction between wave and particle, Professor Li Xiaoqing and his collaborators have established the equation of cosmic self-generated magnetic field, which has been widely used in solar physics, the aurora region of the earth and the abnormal viscosity of astrophysical accretion disks, and the results are consistent with the experiments. Based on the analysis of the fine interaction between plasmon and macro MHD, a set of nonlinear equations coupled with solitary waves of MHD and plasmon are established, and a new magnetic reconnection theory driven by solitary waves is developed. Professor Li Xiaoqing and Associate Professor Zhang Hang proved theoretically that the transverse field of plasma will cause self-similar collapse due to unstable modulation, and analyzed the evolution of magnetic field from two aspects of magnetohydrodynamics and plasma dynamics respectively, thus explaining the intermittence observed by solar magnetic field and the abnormal viscosity required for accretion of celestial accretion disks.

(h) Associate Professor Bian Weihao and his collaborators used the SDSS data to study the dispersion relationship between the mass of black hole in the center of active galactic nuclei and the velocity of its host galactic nuclei. It was found that NLS1s did not follow the M-σ relationship found in normal neighboring galaxies, which provided new clues for determining the dispersion relationship of the velocity of host galactic nuclei in active galactic nuclei and the formation and evolution of black holes and galaxies. They also used ASCA data of Japanese hard X-ray satellite to analyze the X-ray light variation of an active galaxy sample. It is found that the magnitude of light variation is strongly correlated with the central black hole, and NLS1s also follows this correlation, which gives a new explanation for the origin of X-ray light variation. The research papers were published in important "SCI" academic journals such as "MNRAS".

(5) Academic exchanges and cooperation: Since 21, members of the discipline have participated in the work of ATLAS International Cooperation Group and BES International Cooperation Group, hosted the 24 National Symposium on Heavy Taste Physics and CP Destruction, and invited more than 4 domestic and foreign experts and scholars, including Professor J. Steinberg, Academician Dai Yuanben of Chinese Academy of Sciences, and Academician Zhao Guangda of Peking University, to visit and give lectures in our hospital. Our discipline has also been visited by more than 3 people in the United States, Britain, Italy, Germany, France, Australia, Singapore, Hong Kong and other countries and regions for academic cooperation and exchanges.

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