I Just Want to Be a Quiet Top Student

Princeton's Department of Mathematics ranks first in the world, and other universities should have no objections.

The Department of Physics at Princeton is very strong, ranking among the top seven in the world.

The physics departments of Harvard, Stanford, Princeton, MIT, Cambridge, Oxford, and Caltech have their own characteristics and high-profile projects. Their points in the physics ranking list are relatively close. Who wants to be the leader in the physics world? There are always people who are dissatisfied with the six families.

The Princeton Department of Physics concentrates its 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 from the Department of Physics at PSU.

With Hackman acting like this, he couldn't be here to spoil the situation... Shen Qi kept his face, and responded to all changes with the same.

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

"Huh?" Shen Qi smiled lightly, friendly army?

Hackman: "The paper you published on PRL, based on the topological treatment of homotopy groups, redefines defects in continuums and crystals, which is of great reference value to us."

"Hmm." Shen Qi suddenly realized that it really was a friendly army.

"I don't care about purely mathematical problems, but Shen, you also have deep research in physics, and your existence is very precious to us." Hackman said.

What Hackman said made Shen Qi sound very comfortable, and he showed a friendly attitude: "Tell me, Professor Hackman, what do you need me to do?"

Hackman saw the latest PRL on Shen Qi's desk. He flipped the PRL to the section "Research on Defect Topology Based on Spherical Stable Homology Groups" and asked: "How is the homology group on the Adams spectrum calculated?" ?”

"Did I not write it in the thesis?" Shen Qi asked back.

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

Shen Qi finally understood the purpose of Hackman's visit. This old man came to ask for advice if he didn't understand. This kind of realistic and pragmatic academic attitude is worthy of recognition. You must know that not every physicist with many honors and titles is as proficient in mathematics as Edward Witten.

"Professor Hackman, it's like this. Let me explain. In the study of the structure of matter in condensed matter physics, I use this mathematical processing method to derive the short exact sequence of the short Zp cohomology group..." Shen Qi Patiently explain his calculation method.

"OK, it's great." Hackman understood, and he shook hands with Shen Qi: "Thank you, come to my office in the physics department for coffee when you are free. In addition, I would like to make a suggestion, can you write physics papers appropriately in the future?" Attach some experimental data or computer simulation data, so that more physicists can understand your theory. If everyone comes to your office to ask questions like me, and you are so enthusiastic, then you will talk to our Mr. President Just as busy."

Shen Qi nodded: "I accept your suggestion, Professor Hackman, by the way, you said you would cite my paper in your project, so can you tell me what your project is mainly about?"

"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 to analyze various microstructures in materials using traditional condensed matter physics methods. It's a bit difficult. And the defect topology processing method based on the spherical stable homotopy group you proposed is very helpful to me, thank you again, Professor Shen." Hackman thanked Shen Qi and left with a fruitful .

Professor Hackman's suggestion is reasonable. My thesis is too strong in mathematics. In most people's minds, I am still a mathematician...Shen Qi opened the ADF software on his computer to strengthen his physics and chemistry Attributes.

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

Professor Hackman ran over to complain about the research results of pure brain supplementation, but he couldn't understand it.

So Shen Qi operates the ADF, and he needs to change some working methods, at least in the current stage of physics research.

ADF is widely used in material chemistry, solid state physics, catalysis, batteries, spectroscopy and other fields. It can simulate chemical reactions, construct microstructures, and calculate various data, with complete functions.

Most of the real operations carried out in the laboratory can be simulated by ADF, which can save a lot of experimental costs.

"Graphite phase nitrogen carbide, g-C3N4, this is a new type of synthetic material, it is in powder form at normal temperature and pressure, and it is non-toxic."

Shen Qi checked the information and got a general understanding of graphite phase nitrogen carbide. He has never seen the real thing, but he is already making changes, at least he tries to understand the real thing.

Today, as pollution becomes more and more serious, energy and the environment are two major problems facing all countries. Solar energy, a clean energy source, has attracted widespread attention from all countries.

Photocatalysis is considered to be a promising technology for converting low-density solar energy into high-density chemical energy. However, traditional semiconductor photocatalysts such as TiO2 have low light absorption efficiency due to their large internal structural defects.

Therefore, it is imperative to find a new type of photocatalyst with strong activity under 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 has its own defects, and it still cannot meet the ambitions of scientists.

Scientists are not willing to let it go. They doped g-C3N4 with metal or non-metal atoms, forcibly changing the microstructure and optical, electrical and other physical properties of g-C3N4, in order to achieve the goal of efficiently converting solar energy, and finally solve pollution and benefit Humanity.

The team of Professor Hackman from the Department of Physics next door is engaged in this great cause of benefiting mankind and saving Mother Earth.

Professor Hackman's confusion is, what kind of element and in what way can it be incorporated into which part of g-C3N4 to achieve the best effect?

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

Shen Qi proposed a theoretically feasible optimization scheme in the article "Research on Defect Topology Based on Spherical Stable Homotopy Group", which gave Professor Hackman hope.

When Shen Qi drafted this paper, he did not pay attention to new materials such as graphite-phase nitrogen carbide. What he did was macroscopic theoretical research, and he did not pay too much attention to specific material applications.

Now Shen Qi became curious about specific substances, and mathematics, physics, and chemistry were deeply integrated and criss-crossed in his heart at this moment.