Also?

What do you call also?

After Xu Mang heard Xiao Man say the word 'also', he showed a curious expression and asked, "You... Somebody in your company is working on fragile topology? It's like a condensed matter physics thing, so what's the fuss about you guys?"

Yang Xiaoman glanced at him, a little unconvinced, and said: "What do you call a broken company like us? Is it good to rely on this kind of broken company to support your laboratory and research institute in the future!"

“...”

"What the hell is going on?" asked Xu Mang helplessly.

"There is an employee in our company who graduated from Oxford University, and he talked about this matter at noon today, boasting that his school has research strength in topology that no one else can match, and no one in the world can be called the first, only them. ”

"And then start blowing what fragile topology ... Even you can't beat Oxford in topology. Yang Xiaoman said angrily: "Lady, I was blown up at the time, and then..."

"Fire him?"

"No... And then I left. Yang Xiaoman said with a smile: "I am also a master's degree from Oxford University, and I am quite capable... Expelled, where to find such a talent, and he knows a lot of secrets. ”

"Oh..."

Xu Mang was a little boring,

I thought something big was going on, but it turned out to be this kind of thing.

"Huh?"

"Are you angry?" Yang Xiaoman leaned into Xu Mang's ear and whispered softly: "You are worse than other Oxfords." ”

"What then?"

"It's a school... One person drowned me with a mouthful of spit. Xu Mang turned his head and kissed Xiao Man's face, then sniffed, and suddenly his face was a little solemn, and said, "Have you changed the perfume?"

"That's right!"

"It's expensive... And it's a limited edition. Yang Xiaoman said: "How is it?"

Xu Mang feels that this perfume is quite compatible with Xiao Man, there is a faint fragrance, which matches her overall temperament very well, but... Just let Xiao Man go, obviously not his own character, Xu Mang decided to take a good look.

"Uh..."

"Perfume is good, but people are not. Xu Mang frowned and said with a serious face.

Words fall,

Xu Mang felt a hint of coldness, and the air around him also condensed.

Yang Xiaoman: (* ̄〈 ̄)

What do you mean?

Is this too long to have a disgust with my wife?

"Hey!"

"Do you want to die?" Yang Xiaoman gritted his teeth and said: "Don't think that I don't dare to beat you, even if you are a great scientist, what can you do, you have to listen to me obediently at home, the "Xu Yang Treaty" still has your name and handprint on it!"

Groove,

Are you still there?

Xu Mang shrank his head and said cautiously: "Don't talk nonsense... I don't even know what the Treaty of Xuyang is. ”

however

The next second,

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

"Humph!"

"Don't cook for Hongu yet!"

Yang Xiaoman saw that Xu Mang was honest, raised his arrogant little head, and said, "I'm going to eat today... Onion oil okra. ”

"Oh..."

Long

The two sat at the table, looking at each other, three dishes and one soup international convention, although Xiaoman's meal was very small, but Xu Mang's appetite was very large, and almost every time there was no leftover, while eating, Yang Xiaoman asked about the adhesive.

"Honey..."

"The raw materials of the adhesive are too expensive, I make a bottle of concentrated puree every time, do you know how much it costs?" Yang Xiaoman said helplessly: "A BMW 7 Series is gone." ”

"Normal. ”

"You don't want to think about how much adhesive you can make in a bottle of concentrated original slurry... What do you want to do with a BMW 7 Series for a villa?" Xu Mang smiled bitterly: "Earn a little money for others, we have earned all the money, and others will gossip." ”

"Okay. ”

"That's right... I'm going to invest 10 million in your scholarship foundation. Yang Xiaoman said: "Buy a reputation." ”

"Whatever you want. ”

For this kind of thing, Xu Mang hardly cares, anyway, 10 million is also a drizzle for Xiao Man, this female capitalist is very rich now, and while engaging in financial harvesting, she uses adhesives to make money.

in a word

There are many kinds of routines.

...

Following

Xiao Man went to the company, while Xu Mang stayed at home to think about the fragile topology.

Mathematically,

Xu Mang failed and couldn't find any useful information at all, so he changed the direction of his thinking, thought about the problem from the perspective of quantum states, and cut into the root of the problem with the most important discovery in condensed matter physics, the quantum Hall effect.

The quantum Hall effect is found in two-dimensional conductive materials, but in three-dimensional systems, a similar effect is called topological insulation, with the outer conductor insulating the inside.

This is a strong topology.

"Strong topology..."

Xu suddenly fell into a memory, as if the strong topological properties came from some strange property of the electron quantum state, what is it?

Oh!

Electrons are not completely around a single atom, but a part of the electrons are delocalized.

"Huh?"

"What if... What happens when some materials are partially electron delocalized, but do not have strong topological properties?" Xu Mang came up with a point of view, he did not know the results of the research of Oxford University for the time being, but it did not prevent him from proposing a new concept.

After that, by calculation,

Xu Mang felt that this idea was quite reliable, although it had no effect, but he had a new thinking.

In Xu Mang's theory, the electronic state can ignore small perturbations, but it is not as robust as the strong topological state, and a slight change in the structure of the material, such as adding a few impurities, can become an ordinary material.

But...

It's useless, it's just fun.

"You have a new lawyer's letter, please pay attention to it!"

The phone rang,

It was a call from Mr. Jiang Dateng.

"Hello?"

"Teacher Teng... What are you looking for me to do?" asked Xu Mang with a smile.

"I knew that you must have forgotten to find you out of the college entrance examination papers in Zhejiang Province. Teacher Teng said with a smile: "The above said... I hope you can produce this year's mathematics and science comprehensive papers in Zhejiang Province, the difficulty... It's up to you to do it yourself. ”

"Huh?"

"Do you still want to sort out the comprehensive papers?"

"How difficult is it for me to look at?" Xu Mang was stunned for a moment, and asked cautiously, "Teacher Teng... I'm a very vicious person, and I'm not afraid that the candidates in Zhejiang Province will be wiped out?"

"It's fine. ”

"When the time comes, they will push you out, and those media will not dare to report on you. Teacher Teng said with a smile.

I...

Okay,

Since you're not afraid of death, then I'm panicking!

"Good!"

"Teacher Teng... Don't blame me for being too ruthless. Xu Mang said seriously: "The difficulty of the question I gave is quite high, which tests the comprehensiveness of students, especially for those so-called geniuses, and the blow will be particularly serious." ”

"Okay!"

"I know your routine, anyway, according to your intentions, you don't need to go to Jiang University, just get the paper out and send it to my mailbox, a scientist of your size asked you to come over, I'm a little embarrassed." Teacher Teng said: "Let's make it this first, I won't bother you." ”

"Oh..."

syllable

Hang up.

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

I'm sorry

Dear Students,

Demanded by your leaders.

Thoughts return to reality,

Xu Mang looked at the theory he had just written, and was a little overwhelmed for a while.

"It seems..."

"I still can't get around graphene. ”

Opening the paper of the research team at the University of Oxford, Xu Mang read the content carefully, according to their experimental report, Xu Mang suddenly felt a little familiar, and when he saw these data, he felt very strange... Who would have thought it was a topological state.

The research team at the University of Oxford directly made superconductivity correlated, and believed that the superconductivity produced by the twisted bilayer graphene was related to the fragile topological state, which was a bit awesome.

Their second paper illustrates the fact that fragile topology is more common than strong topology, and that about a quarter of materials are strongly topological at present, but studies have shown that almost all materials have electrons in fragile topological states.

Then hundreds of thousands of examples of suspected fragile topology were found in crystal databases.

Suspected

But it's not clear.

"Hello?"

"Professor Fan... Can you spare two days in the lab?" Xu Mang said with a smile: "Nothing... Just let others know I'm still there. ”

...

Following

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

Yesterday he received a phone call and was told to borrow the laboratory, and in the face of Xu Mang's request, Fan Zhilong naturally agreed, not to mention that he was the deputy director of the physics department, and in terms of reputation alone, he should consider his request first.

"Huh?"

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

“...”

"Are you usually quite idle?" Fan Zhilong said helplessly: "Anyway, what is the situation this time?

"Nothing..."

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

Fan Zhilong was stunned for a moment: "Of course I know this, it belongs to the field of our condensed matter physics, it seems... Not long ago, a research team at the University of Oxford discovered this amazing topological state in your bilayer twisted graphene. ”

Fan Zhilong asked: "But this is currently only circumstantial evidence, and direct evidence is very difficult, almost... You know, anyway, all the professors in the physics department of Fudan University think it's unlikely. ”

"Really?"

Xu Mang took a bite of the bun and said indifferently: "This is not necessarily... I think it's possible. ”

“...”

"You... Fan Zhilong said in surprise: "This is different from strong topology, which exhibits measurable phenomena, while the measurable effect of fragile topology is very weak, so weak that it is almost negligible. ”

The Oxford team only found circumstantial evidence of a fragile topology. Fan Zhilong said: "Have you thought it through?"

"It's not a very difficult question. Xu Mang said with a smile: "The research team at the University of Oxford has found it, but it has not been perceived, just like when I discovered that bilayer torsional graphene can superconduct, but I did not perceive the suspected topological state." ”

Fan Zhilong didn't speak, since Xu Mang felt that there was no problem, then there was really no problem, after all... His name is Xu Mang, and this name means full of miracles.

"Is two days enough?"

"Why don't I squeeze out a little more time?" Fan Zhilong asked, "How about four days?"

Xu Mang took a sip of soy milk, raised his head and smiled: "One day is enough." ”

Fan Zhilong: ???

......

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