Princeton's mathematics department ranks first in the world, and other universities should have no objection.

Princeton's physics department is very strong and ranks in the top seven in the world.

The physics departments of Harvard, Stanford, Princeton, mit, Cambridge, Oxford, and California Polytechnic have their own characteristics and fist projects. Their points on the physics ranking list are relatively close. Whoever wants to be the leader in the physics industry, there are always people who are dissatisfied with the other six companies.

Princeton Physics Department concentrates resources on condensed matter physics, cosmology, and high-energy physics. Hackman, who came to visit, is a professor in the field of condensed matter physics in the Physics Department of PKU.

Hackman is not here to disrupt the situation like this, right... Shen Qi doesn't show any expression and responds to changes in the same way.

Unexpectedly, Hackman said, "Shen, our physics department needs you."

"Hmm?" Shen Qi smiled faintly, friendly forces?

Hackman: "This paper you published on PRL, based on the topological processing of homogeneous groups, redefining defects in continuum and crystals, is of great reference value to us."

"Hmm." Shen Qi suddenly realized that he was indeed a friendly army.

"I don't care about pure mathematical problems, but Shen, you have a deeper study in physics, and your existence is very valuable to us," said Hackman.

Hackman's words made Shen Qi sound quite comfortable. He showed a friendly attitude: "Tell me, Professor Hackman, what do you need me to do?"

Hackman saw a newest PRL on Shen Qi's desktop. He flipped the PRL to the "Study on the defect topology of spherical stable homoethic groups" and asked: "How is the homoethic group calculated on the Adams spectrum?"

"Don't I write it in the paper?" Shen Qi asked back.

"The calculation results are very beautiful, but your calculation process...how to say it is quite complicated. That's it. I happen to have a project on hand, and I need to cite the theoretical basis in your paper, mainly mathematical processing basis, so it's better for me to ask clearly." Hackman said.

Shen Qi finally understood the purpose of Hackman. If this guy doesn't understand, he will ask for advice. This kind of pragmatic academic attitude is worthy of recognition. You should know that not every physicist with many honors and titles is as proficient in mathematics as Edward Witten.

"Professor Hackman, this is what I said. Let me explain that in the study of material structure in condensed matter physics, I use this mathematical processing method to derive a short positive sequence of co-modulated groups on short zp..." Shen Qi patiently explained his calculation method.

"Ok, it's great." Hackman understood, and shook hands with Shen Qi: "Thank you, I'm here to have coffee in my office in the Department of Physics. I would like to make a suggestion. In the future, if you write a theory paper on physics, can you properly attach some experimental data or computer simulation data, so that more physicists can understand your theory. If everyone comes to your office like me and you are so enthusiastic, then you will be as busy as our President."

Shen Qi nodded: "I accept your suggestions, Professor Hackman, by the way, you said you would quote my paper in your project, so is it convenient to reveal what your project is mainly about research?"

"Of course, you have the right to know that inspired by graphene, my project is mainly to study the electronic structure and optical properties of graphite-phase nitrogen carbide quantum dots, and it is already a bit difficult to analyze various microstructures in materials using traditional condensed matter physical means. And the defect topological treatment method based on spherical stable homoethic groups you proposed is very helpful to me. Thank you again, Professor Chen." Hackman expressed his gratitude to Shen Qi and left with great harvest.

Professor Hackman's suggestion makes sense. My paper has too strong mathematical properties. In the minds of most people, I am still a mathematician... Shen Qi opened the adf software on the computer to strengthen his physical and chemical properties.

adf is a computer simulation and analysis software. Shen Qi has been installed for several months. He occasionally plays with it. Most of his work relies on brain repair.

Professor Hackman came over to complain about the research results of pure brain supplements, but he couldn't understand them.

So Shen Qi operated adf and needed to change some working methods, at least in the current stage of physics research.

Adf is widely used in the fields of material chemistry, solid physics, catalysis, batteries, spectroscopy, etc. It can simulate chemical reactions, build microstructures, calculate various data, and have complete functions.

Most real operations performed in the laboratory can be simulated, which can save a lot of experimental costs.

"Graphite phase nitrogen carbide, g-c3n4, is a new synthetic material, which is powdery under normal temperature and pressure, and is non-toxic."

Shen Qi looked up the information and had a general understanding of graphite phase nitrogen carbide. He had never seen the real thing, but he was already making changes. At least he tried to understand the real thing.

Today, when pollution is getting worse, energy and the environment are two major problems faced by countries. Solar energy, a clean energy, has attracted widespread attention from all countries.

Photocatalysis is considered a technology that is expected to convert low-density solar energy into high-density chemical energy. However, traditional semiconductor photocatalysts such as tio2 have low light absorption efficiency due to their own large internal structural defects.

Therefore, it is imperative to find a new photocatalyst that has strong activity in visible light, so the graphite phase nitrogen carbide g-c3n4 was synthesized by scientists.

g-c3n4 is better than tio2, but this new synthetic material itself has defects and still cannot meet the ambitions of scientists.

Scientists are not willing to give up. They forcibly change the microstructure and optical, electrical and other physical properties of g-c3n4 by doping metal or non-metal atoms in g-c3n4 to achieve the goal of efficiently converting solar energy, ultimately solving pollution and benefiting mankind.

Professor Hackman's team in the physics department next door is engaged in this great cause of benefiting mankind and saving Mother Earth.

Professor Hackman’s confusion is, in what way, which element is incorporated into which part of g-c3n4 to achieve the optimal effect?

This returns to the basic theoretical research of condensed matter physics. Can this theory be optimized for the microstructure analysis and defect definition of condensed matter?

In his article "Research on defect topology based on spherical stable homoethic group", Shen Qi proposed a theoretically feasible optimization solution, which gave Professor Hackman hope.

When Shen Qi drafted this paper, he did not pay attention to new materials such as graphite phase nitrogen carbonization. He did macro theoretical research and did not pay much attention to specific substance applications.

Now Shen Qi is curious about specific matter. Mathematics, physics, and chemistry are now deeply integrated and intertwined in his heart.
Chapter completed!