University physics experiment center
department of physics
The discipline of theoretical physics of Nanjing Normal University began to recruit and train graduate students in 1978, and was awarded a master's degree in 1990 and a doctorate in 2003. Since 1996, the discipline of theoretical physics has been rated as the key discipline of Jiangsu provincial government in the Ninth Five-Year Plan and the Tenth Five-Year Plan.
Since 200 1, the construction of key disciplines of theoretical physics in Nanjing Normal University has been running well, and the task of discipline construction planning has been completed in an all-round way. Important progress or breakthroughs have been made in the construction of degree programs, discipline echelon, laboratory construction and scientific research, and outstanding contributions have been made to the national economic construction and the development of science and technology in Jiangsu Province, mainly in the following aspects:
(1) degree program construction: in 2003, I applied for and obtained the right to award a doctorate in theoretical physics. Relying on theoretical physics, we cultivate new degree programs. In 2003, we declared and obtained two master's degree programs in condensed matter physics, particle physics and nuclear physics, and in 2005, we declared and obtained a master's degree program in physics. Major breakthroughs have been made in the construction of degree programs.
(2) Academic echelon construction and personnel training: After years of unremitting efforts, theoretical physics has a teaching and research team with high academic level, reasonable age structure of professional titles and strong overall scientific research strength. Since 200 1, 8 doctors (later) have become new members of this discipline. At present, there are 23 discipline members, including young and middle-aged experts with outstanding contributions in China 1 person, 2 in distinguished professor, 6 doctoral supervisors, 0 master supervisors1person, and 7 discipline members with doctoral degrees1person.
Theoretical physics undertakes 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 strive to cultivate students' innovative ability. In postgraduate training, high-level postgraduate courses and special lectures reflecting the latest research trends at home and abroad can be offered. Through the careful guidance and strict requirements of the tutor, students can quickly enter the forefront of the subject. When graduate students graduate, most of them can publish papers in international and national core academic journals. 200 1 Up to now, there are more than 600 undergraduates and 43 postgraduates majoring in physics education. There are 63 master students and 9 doctoral students. More than 80% of our graduates work in universities and middle schools in Jiangsu Province, which has made important contributions to China's national economic development and scientific and technological progress.
(3) Laboratory construction: From 200 1, the "Scientific Computing Laboratory" was upgraded. The microcomputer cluster has been increased from 32 nodes to 64 nodes (128 CPU), and two computer rooms of 140 m2 have been newly built, and 70 P-IV microcomputers and high-speed laser printers have been added, so that the computing power has been improved by 2~3 orders of magnitude. The discipline has also ordered 20 original English magazines and more than 80 Chinese periodicals, and can download more than 6,000 academic papers from English periodicals through the Internet. Theoretical physics has a high-level teaching and research platform.
(4) Scientific research: Since 200 1, we have completed the national climbing plan subproject, the national "973" project, the national natural science foundation subproject 16, provincial and departmental projects, and undertaken the national natural science foundation project 10, three projects of the Ministry of Education and provincial and departmental scientific research projects/kloc. The total funding for the research project is 3.38 million yuan. 200 1 Up to now, 4 academic monographs have been published, and 3 academic papers11have been published in major academic journals at home and abroad, such as phys. rev. America and Phys. Rev.A-E, etc.
The main scientific research achievements since 200 1 are as follows:
(1) Professor Zhenjun Xiao and his collaborators have systematically studied the weak decay process and radiation decay process of B meson under the framework of standard model, double Higgs model and minimum supergravity model. The new physical corrections of observable physical quantities such as branch ratio and CP destruction of 1 15 B meson decay channel 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 80 times.
(Professor Pingalen and his collaborators consider the mixing of various color structures by introducing quark shedding localization and color shielding. Through quantitative calculation, it is concluded that the five quark system can have * * * vibration dynamics. For NK system, I=0 channel has equivalent gravity, and I= 1 channel has strong repulsion. Due to the influence of approximation and error, the original experimental analysis is unreliable: for θ+with double quark structure, quantitative calculation shows that the energy of negative parity state is low, which is different from Jaffe-Wilczek's conclusion; In the model of Pingalen et al., the energy of the five quark system with rhombic 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
(3) Professor Tong Peiqing cooperated with Professor Han of Baptist University to study whether the two-dimensional XY model (that is, the gauge glass model) has phase transition and low temperature state under strong disorder. This is a long-standing debate in the scientific community. The vortex in the system is mapped to Coulomb gas. Through numerical simulation, it is found that the low-energy excited state of the system can be described by weak interaction vortex and gapless anti-vortex pair. It is found that the stiffness of spin wave decays with the power of distance through the calculation of linear dielectric shielding by renormalization group method. Large-scale multi-canonical Monte-Carlo method is used to calculate the low-temperature specific heat and 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 Physical Review Letters.
(d) Professor Chen and his collaborators have studied the structure, diffusion, decay, absorption or emission spectra of self-trapping holes and self-trapping excitons in KMgF3 materials in detail. This study has important theoretical significance for improving the performance of KMgF3 materials in scintillation performance, radiation dose, tunable laser and other applications.
Professor Chen, Associate Professor Huang and their collaborators also conducted first-principles research on superconductivity of ternary silicide superconducting materials. The results show that the soft mode in this kind of materials plays an important role in the superconductivity of the materials. Considering the anharmonicity of the soft mode, the calculated superconducting transition temperature is in good agreement with the experimental data. Based on the first principles, they made a comprehensive study on the electronic structure, phonon structure and electron-phonon interaction of materials, 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 future application of superconducting silicide in electronic devices. The research papers were published in important "SCI" academic journals such as phys.rev.b
(e) Professor Xu and Professor Xu have done a lot of research work on the perturbation theory of the universe, the theory of higher-order gravity and the relativistic celestial mechanics in 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. Newton's approximation and non-rotation are consistent with the famous Wahr model in the 1980s. The research papers were published in important "SCI" academic journals such as phys.rev.d.
(f) Professor Yuan Qirong cooperated with colleagues at home and abroad, and used the 60/90 cm Schmidt telescope of the National Astronomical Observatory of China to conduct multicolor photometric observation (BATC) on the nearby galaxy cluster Yinling 2255, and obtained more than 7,000 V.
(g) According to the nonlinear wave-wave and wave-particle interaction, Professor Li Xiaoqing and his collaborators 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 plasmons and macro MHD, a set of nonlinear equations coupled with MHD solitary waves and plasmons is established, and a new magnetic reconnection theory driven by solitary waves is developed. Professor Li Xiaoqing and Associate Professor Zhang Hang proved in theory 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 intermittent observed solar magnetic field and the abnormal viscosity required for accretion of celestial accretion disks.
(h) Associate Professor Bian Hao Wei and his collaborators used SDSS data to study the dispersion relationship between the mass of the black hole in the center of the active galactic nucleus and the velocity of the host galactic nucleus. It is found that NLS 1s does not follow the M-σ relationship found in normal neighboring galaxies, which provides new clues for determining the velocity dispersion relationship 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 changes of an active galaxy sample. It is found that the size of light variation has a strong correlation with the central black hole, and NLS 1s also follows this correlation, giving 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 exchange and cooperation: Since 20001,members of the discipline have participated in the work of ATLAS International Cooperation Group and BES International Cooperation Group, presided over the 2004 national symposium on heavy flavor physics and CP destruction, and invited more than 40 domestic and foreign experts and scholars, including Professor J. Steinberg, Nobel Prize winner in physics, Academician Dai Yuanben of Chinese Academy of Sciences and Academician Zhao Guangda of Peking University, to visit and give lectures in our institute. More than 30 people in our discipline have also visited the United States, Britain, Italy, Germany, France, Australia, Singapore, Hong Kong and other countries and regions for academic cooperation and exchanges.
Communication engineering department
Department of applied physics
Institute of Physical Education
Department of electronic information engineering