63 years ago, the famous Chinese scientist and Nobel Laureate of Physics, Li Zhengdao and Yang Zhenning proposed the existence of “Li Yang Zero†in the virtual magnetic field. The reporter learned from the China University of Science and Technology on January 23 that Prof. Peng Xinhua of the school had cooperated with the theoretical research group of Prof. Liu Renbao of the Chinese University of Hong Kong a few days ago to detect the “Li Yang Zero†in the virtual magnetic field for the first time in the world. The results were published in the latest edition of the international authoritative physical journal Physical Review Letters.
Speaking of "Li-Yang Zero," I'll have to mention the Ising model. The Yi Xin model is a ferromagnetic model named after the physicist Isting. It is used to describe the ferromagnetism of a substance. It was proposed to explain the phase transition of a ferromagnetic material, that is, the magnet is heated to a certain critical temperature. Above the temperature, there will be disappearance of magnetism, while cooling below the critical temperature will show magnetic properties. In 1952, Li Zhengdao and Yang Zhenning proved that the Yi Xin ferromagnetic model has a point in the complex number field where the formula function of the system can be zero (ie, "Li Yang zero point"). Through "Li Yang zero point", various systems can be obtained. Thermodynamic properties. Because these zeros exist under the condition of a virtual magnetic field, "Li-Yang Zero" has been considered to exist only in theory.
Liu Renbao's group theory research shows that if a detection bit coupled with the system is introduced, the zero point of the quantum coherence of the probe bit in the time domain corresponds to the “Li Yang zero†of the system, which proves that “Li Yang zero "The possibility of direct observation of the experiment. The team of China University of Science and Technology used the trimethyl phosphite molecular model to simulate the Yixin ferromagnetic system. Through the NMR method, the Li-Yang zero point of the system was first observed directly in the experiment. Through these zero points, the free energy of the system was studied. Phase change phenomenon.
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