Chapter 493

Also?

What is it?

After hearing Xiaoman say "Ye", Xu mang showed a trace of curiosity and asked, "do you... Someone in your company is studying the fragile topology? This seems to be something about condensed matter physics. What's your company doing? "

Yang Xiaoman took a look, a little unconvinced, said: "what is our kind of broken company? The future depends on this kind of broken company to support your laboratory and Research Institute

"..."

"what is the situation?" Xu mang asked helplessly.

"We have an employee who graduated from Oxford University. He talked about this matter at noon. He boasted that his school has incomparable research strength in topology. No one in the world can be called the first, only they."

"And then you're going to blow the frail Topology... You can't even surpass Oxford in topology." Yang Xiaoman said angrily, "I blew my hair at that time, and then..."

"fired him?"

"No... and then I left." Yang Xiaoman said with a smile: "he is also a master's degree from Oxford University. He has a lot of skills... He's fired. Where can I find such a talent? And he knows a lot of secrets."

"Oh..."

Xu mang is a little boring,

he thought that something big had happened, which turned out to be such a thing.

"Ah?"

"Angry or not?" Yang Xiaoman reached Xu Mang's ear and whispered, "you are worse than Oxford."

"What shall we do?"

"It's a school... I'm drowned by one spit." Xu man turned over and kissed little man's face, and then his nose began to suck. Suddenly his face was a bit dignified. He said, "change perfume?"

"Yes

"It's expensive... And limited edition." Yang Xiaoman said, "how about it?"

Xu ran felt that this perfume and Xiaoman collocation had a faint fragrance, which collocation with her overall temperament. However, it was obvious that she did not let her go down, so Xu Xu decided to make a good skin.

"er..."

"perfume is good, but people can't." Xu mang frowned and said earnestly.

As a result,

Xu mang felt a little cold and the surrounding air was condensed.

Yang Xiaoman: (* ~ ＾)

What do you mean?

It's too long. I'm disgusted with my mother?

"Hello

"Do you want to die?" Yang Xiaoman gnashed his teeth and said, "don't think I dare not beat you. Even if you are a great scientist, what can you do? Listen to me at home. There are your name and fingerprints on the Treaty of Xu Yang."

The horizontal trough,

is still there?

Xu mang shrunk his head and said cautiously, "don't talk nonsense... I don't know anything about the Treaty of Xu Yang."

However,

the next second,

Yang Xiaoman took out a copy of paper from his bag, which was really a copy of the Treaty of Xu Yang.

"Hum!"

"Don't cook for the palace yet!"

Yang Xiaoman saw Xu mang honest, raised his arrogant small head, said: "today I want to eat... Onion oil okra."

"Oh..."

for a long time,

for a long time,

two people sat at the table, looking at each other. According to the international practice of "three dishes and one soup", although Xiaoman's appetite is very small, Xu Mang's appetite is very big, almost every time he doesn't have any left over. During the meal, Yang Xiaoman asks about the adhesive.

"Dear..."

"the raw materials of adhesive are too expensive. Do you know how much it costs to make a bottle of concentrated stock every time I make it?" Yang Xiaoman said helplessly: "a BMW seven series is gone."

"Normal."

"You don't think about how much adhesive can be made with a bottle of concentrated stock solution... How much more do you want to change a BMW seven series into a villa?" Xu mang said with a wry smile: "we can earn some money for others, and we will be gossiping about it."

"All right."

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

"Whatever you want."

Xu mang hardly cares about this kind of thing. In any case, ten million yuan is also a drizzle for Xiaoman. This female capitalist is rich now. She is engaged in financial harvesting and making money with adhesive.

In short,

routines are various.

...

the next day,

Xiaoman went to the company, while Xu mang stayed at home thinking about the fragile topology.

In mathematics,

Xu mang failed and could not find any useful information at all. After that, he changed his thinking direction and thought about the problem from the perspective of quantum state, and cut into the root of the problem with the most important discovery in condensed matter physics, quantum Hall effect.Quantum Hall effect has been found in two-dimensional conducting materials, which can be found in three-dimensional systems. However, the similar effect is called topological insulation and internal insulation.

This is a strong topology.

"Strong topology..."

Xu mang suddenly fell into the memory, as if the strong topological properties came from some strange properties of electronic quantum states. What is it?

Oh!

Electrons are not completely surrounded by a single atom, but some of them are delocalized.

"Ah?"

"What happens if... Some materials have partial electron delocalization but do not have strong topological properties?" Xu mang came up with a view that he did not know the research results of Oxford University for the time being, but did not hinder the proposal of a new concept.

After that, through calculation,

Xu felt that this idea was very reliable. Although it had no effect, he had a new thinking.

In Xu Mang's theory, electronic states can ignore small perturbations, but they are not as robust as strong topological states. A little change in material structure, such as adding some impurities, can turn into ordinary materials.

But...

it's no use, it's just fun.

"You have a new lawyer's letter, please check it!"

The mobile phone rings,

it's from Mr. Jiang Dateng.

"Hello?"

"Mr. Teng... What do you want me to do?" Xu mang asked with a smile.

"I knew you must have forgotten, looking for your college entrance examination paper in Zhejiang Province." Teng said with a smile: "the above said... I hope you can come up with this year's Zhejiang Province mathematics and management papers, the difficulty... You can do it yourself."

"Ah?"

"Do you want a comprehensive paper?"

"How difficult is it for me?" Xu mang Leng for a moment, carefully asked: "Teng teacher... I this person is very vicious, above not afraid of Zhejiang Province candidates annihilation?"

"It's OK."

"You will be pushed out when the time comes. Those media dare not report you in a random way." Teng said with a smile.

I...

OK,

since you are not afraid of death, I will panic!

"Good!"

"Mr. Teng... Don't blame me for my ruthlessness." Xu said seriously: "the questions I gave are very difficult. They test the students' comprehensiveness, especially for those so-called talents, which will be particularly serious."

"All right

"I know your routine. You don't need to go to Jiangda anyway. You can just send out the paper and send it to my email. It's a little bit embarrassing for a scientist of your age to ask you to come here." Teng teacher said: "first of all, it's settled. I won't disturb you."

"Oh..."

PA,

hang up.

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

Sorry,

students,

your leaders asked.

His thoughts returned to reality,

looking at the theory he had just written, Xu mang was a bit at a loss.

"It seems that..."

"still can't get around graphene."

After opening the paper of the Oxford University research group, Xu mang carefully read the above contents. According to their experimental report, Xu mang suddenly felt familiar. When he saw these data, he felt very strange... Who ever thought it was topological state.

However, the Oxford University research group actually directly related superconductivity, and believed that the superconductivity produced by the twisted double-layer graphene has something to do with the fragile topological state, which is a little strong.

In their second paper, it is shown that fragile topologies are more common than strong topologies. At present, about a quarter of materials have strong topologies, which can be studied to show that almost all materials have electrons in fragile topological states.

Then we find hundreds of thousands of suspected fragile topological phenomena in the crystal database.

Suspected,

but not clear.

"Hello?"

"Professor Fan, could you spare me two days in the lab?" Xu mang said with a smile: "nothing... Just let others know that I am still there."

The next day,

the next day, fan Zhilong, a professor of condensed matter physics at Fuda, came to the laboratory early to wait for Xu Mang's arrival.

Yesterday, he received a phone call and was told to borrow the laboratory. Fan Zhilong naturally agreed to Xu Mang's request. Let alone that he was the deputy director of the physics department, he should consider his request first.

"Ouch?"

"Professor fan is so early?" Carrying a bag of soybean milk and steamed stuffed bun, Xu mang came to the laboratory with a smile and asked, "did you have breakfast?"

"..."

"are you usually quite free?" Fan Zhilong said helplessly, "what is the situation this time? You're on the other side? ""Nothing..."

"do you know the fragile topology?" Xu asked.

Fan Zhilong was stunned for a moment: "of course, this belongs to our field of condensed matter physics. It seems that not long ago, a research group from Oxford University discovered this magical topological state in your double-layer twisted graphene."

Fan Zhilong asked, "but at present, there is only indirect evidence, direct evidence is very difficult, almost... You know, anyway, all the professors in Physics Department of Fuda think it is impossible."

"Is it?"

Xu mang took a bite of steamed buns and said calmly, "it's not necessarily... I think it's possible."

"..."

"you... You can't study fragile topological states in the laboratory?" "This is different from strong topology, which shows measurable phenomena, while weak topology effects are so weak that they are almost negligible," Fan said in surprise

"The Oxford team has only found indirect evidence of the fragile topology phenomenon." "Have you considered it clearly?" said fan

"It's not really a very difficult question." Xu said with a smile: "the Oxford University research team has discovered, but did not notice, just as I found that double-layer twisted graphene can superconduct, but did not detect the suspected topological state."

Fan Zhilong did not speak. Since Xu mang felt that there was no problem, there would be no problem. After all, his name is Xu Mang, which means full of miracles.

"Two days is enough?"

"Can I squeeze in a little more time?" "How about four days?" fan asked

Xu mang drank a mouthful of soybean milk, raised his head and said with a smile: "one day is enough."

Fan Zhilong???

......

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