“Normal.”

"You don't want to think about how much adhesive can you make for a bottle of concentrated raw slurry? What else do you want?" Xu Mang smiled bitterly: "I'll make some money for others. We'll get rid of the money and will be gossiped by others."

"All right."

"By the way, I plan to invest 10 million in your scholarship foundation." Yang Xiaoman said: "Buy a reputation."

"what ever."

Xu Mang hardly asked much about this kind of thing. Anyway, 10 million is a drizzle for Xiaoman. This female capitalist is so rich now. She is engaged in financial harvesting while using adhesives to make money.

Anyway,

Various routines

The next day,

Xiaoman went to the company, while Xu Mang stayed at home to think about the problem of fragile topology.

In mathematics,

Xu Mang failed and could not find any useful news. Then he changed the direction of thinking, thought about the problem from the perspective of quantum states, and used the most important discovery of the quantum Hall effect in condensed matter physics to get to the root of the problem.

The quantum Hall effect was found in two-dimensional conductive materials, which may be similar in three-dimensional systems but are called topological insulation and internal insulation of the outer conductor.

This is a strong topology.

"Strong topology"

Xu Mang suddenly fell into memories, as if the strong topological properties originated from some strange characteristic of the electron quantum state. What exactly is it?

oh!

Electrons do not completely surround a single atom, but some of them are delocalized.

"well?"

"What happens if some materials have partial electrons delocalized but do not have strong topological properties?" Xu Mang came up with a point of view. He did not know the research results of Oxford University for the time being, but it did not prevent the proposal of a new concept.

Afterwards,

Xu Mang thought this idea was quite reliable. Although it had no effect, he had a brand new thinking.

In Xu Mang's theory, the electron state can ignore small disturbances, but it is not as stable as the strong topological state. If you slightly change the material structure, such as adding a little impurity, you can become an ordinary material.

but

It's useless, it's just fun.

"If you have a new lawyer's letter, please be careful to check it!"

The phone rang,

It was a call from Teacher Jiang Dateng.

"Hello?"

"What did Teacher Teng ask me for?" Xu Mang asked with a smile.

"I knew you must have forgotten and found you to give the Zhejiang Provincial College Entrance Examination Paper." Teacher Teng said with a smile: "The above said I hope you can get the Zhejiang Provincial Mathematics and Science Certificate Paper this year. You can do the difficulty yourself."

"ah?"

"We still need to produce comprehensive science papers?"

"I'm going to do the difficulty?" Xu Mang was stunned for a moment and asked carefully: "Teacher Teng, I am quite vicious. Are you afraid that all the candidates in Zhejiang Province will be destroyed?"

"fine."

"You will be pushed out at that time, and those media dare not report it randomly on you." Teacher Teng said with a smile.

I

It's OK,

Since you are not afraid of death, I will be so furious!

"good!"

"Teacher Teng, don't blame me for being too ruthless." Xu Mang said seriously: "The questions I gave are quite difficult, which tests the students' comprehensiveness, and will cause a particularly serious blow to those so-called geniuses."

"Okay!"

"I know your routine. Anyway, according to your wishes, you don't need to go to Jiangda. Just send the papers to my email address and send them to your mailbox. I feel a little embarrassed if a scientist of such a big age asks you to come here." Teacher Teng said: "I'll make sure to say this first, and I won't bother you."

"oh"

Bang,

hang up.

Xu Mang looked at the interrupted mobile phone interface and sighed.

sorry,

Students,

What your leaders demand.

Thoughts return to reality,

Xu Mang looked at the theory he had just written and was a little at a loss for a moment.

"It seems"

"It's still impossible to get around graphene."

Opening the paper of the Oxford University research group, Xu Mang read the above content carefully. According to their experimental reports, Xu Mang suddenly felt familiar. When he saw these data, he felt very strange that anyone had thought it was a topological state.

The research team at Oxford University actually directly related superconducting and believed that the reversed bilayer graphene produced by superconducting is related to fragile topological states, which is a bit awesome.

Their second paper illustrates a situation where fragile topology is more common than strong topology. Currently, about one-quarter of materials have strong topology, and studies can show that almost all materials have electrons with fragile topology states.

Then hundreds of thousands of examples of suspected fragile topological phenomena were found in the crystal database.

Suspected,

But it's not clear.

"Hello?"

"Can Professor Fan's laboratory give me two days free?" Xu Mang said with a smile: "Nothing is just to let others know that I'm still there."

The next day,

Fan Zhilong, professor of condensed matter physics at Fuda University, came to the laboratory early and waited for Xu Mang's arrival.

Yesterday he received a call and was told to borrow the laboratory. When facing Xu Mang's request, Fan Zhilong naturally agreed. Not to mention that he is the deputy director of the physics department, just by reputation, he should first consider his requirements.

"Ouch?"

"Professor Fan is so early?" Xu Mang came to the laboratory with a bag of soy milk and buns with a smile and asked, "Have you had breakfast?"

""

"You are usually quite leisurely?" Fan Zhilong said helplessly: "What's going on this time? Are you having a fight with someone else?"

"nothing"

"Do you know the fragile topology?" Xu Mang asked.

Fan Zhilong was stunned for a moment: "Of course I know this, which belongs to our field of condensed matter physics. It seems that a research team at Oxford University discovered this magical topological state in your double-layer twisting graphene."

Fan Zhilong asked: "But there is only indirect evidence at present, and direct evidence is very difficult. Almost you know. Anyway, all professors from the Department of Physics of the University of Restoration think it is unlikely."

"Yeah?"

Xu Mang took a bite of the bun and said calmly: "I don't think this is possible."

""

"Will you study fragile topological states by borrowing a laboratory?" Fan Zhilong said in surprise: "This is different from strong topology. Strong topology will show measurable phenomena, while the measurable effect of fragile topology is very weak, so weak that it is almost negligible."

"Oxford's research team has only found indirect evidence, which is suspected to be a fragile topological phenomenon." Fan Zhilong said: "Have you considered it clearly?"

"Actually, this is not a very difficult problem." Xu Mang smiled and said: "The research team at Oxford University has discovered it, but it has not noticed it, just like when I discovered that the double-layer twisted graphene can superconduct, but I did not notice a suspected topological state."

Fan Zhilong didn't say anything. Since Xu Mang felt that there was no problem, there was really no problem. After all, his name was Xu Mang, and the name meant full of miracles.

“Is two days enough?”

"Why should I squeeze out some more time?" Fan Zhilong asked, "How about four days?"

Xu Mang took a sip of soy milk, raised his head and smiled, "A day is enough."
Chapter completed!