On this day,

Fan Zhilong found several bigwigs in the industry, Wang Jiafu, a big man in theoretical physics, Hua Yanfeng in the field of particle physics, and Professor Li Aimin in optics.

"I'll tell you something..."

"Don't be surprised!"

"Do you remember the fragile topological state we discussed earlier?" Fan Zhilong said with a mysterious face.

Wang Jiafu nodded and asked curiously: "Aren't we still making a judgment on this question?" It is almost impossible to find direct evidence, after all, this is not a strong topology, and if the topological properties of the material are still calculated according to its chemical properties and symmetry, it is basically impossible. ”

"Yes!"

"But there are those who don't believe in evil. Fan Zhilong said seriously: "He... I won't elaborate too much, you all know him very well, Professor Wang, you were his class instructor before. ”

“...”

“...”

“...”

No need to guess,

It must be Xu Mang!

The three of them almost pointed the finger at the same person, in the thinking of Wang Jiafu and others, only Xu Mang could have the ability not to believe in evil, and when the whole world was questioning, he dared to go up and slap everyone's face.

But...

I'm afraid it's going to be hard this time!

Fragile topology is one of the world's most recognized problems, and although the research team at the University of Oxford found a phenomenon that is suspected to be fragile topology in Xu's 'magic angle' bilayer graphene, there is a lot of evidence that it is not a fragile topology at all.

Fragile topology is a concept that has harmed many scientists since its birth, and gradually this field has become unpopular, until the recent discovery, but the thunder and rain are small, and many have taken wait-and-see measures.

Probably only the top research schools in the world really study fragile topology.

"Xu Mang..."

"I'm curious how he plans to solve this problem, which is a headache for the whole world. Hua Yanfeng thought for a long time and sighed: "Actually... I went back and thought about the fragile topology for three days, but I still couldn't find any way to prove its existence. ”

"Usually..."

"When everyone accepts a strong topology, the phenomenon that can be directly measured, and then look at the fragile topology, if the evidence does not reach the level of the former, is not convincing. Hua Yanfeng said.

"Hmm!"

"I basically agree with that. Professor Li Aimin nodded: "We can see from last year's strong topology search that at that time, symmetry was used as a judgment, mirror symmetry, rotational symmetry, and translational symmetry. ”

"The direction of symmetry determines where and how electrons move in the lattice of the crystal structure...", Professor Li Aimin continued, "Symmetry can also be used to predict the behavior of electrons, and thus whether a material is likely to have a topological state. ”

"What should Xu Mang do?"

Li Aimin asked: "How should he determine the fragile topology? Or how to determine the fragile topology? At present, the research institute at the University of Oxford has only discovered the suspected fragile topology phenomenon, and whether it is still debated is still being debated. ”

"I'll tell you what I think. ”

"Putting aside the complexity of the problem, it is natural that some completely new concepts will be discovered based on the name Xu Mang, which... He's done so much impossible research before, and I don't need to say more. Fan Zhilong said: "Just give him time..."

"It's a pity..."

"Do you know how much time Xu Mang plans to spend this time?" Fan Zhilong asked solemnly.

How much time?

One month?

Trimester?

Or... About half a year?

The three professors of the Department of Physics of Fuda University did not give a specific time, after all, in the face of Xu Mang's monster, if he reported a time casually, he might be slapped in the face, and it was not once or twice that he was slapped in the face by Xu Mang.

"So cautious?"

"It's fine... Just tell me about the time you envisioned. Fan Zhilong said.

"I think half a month. ”

"I'll guess a week. ”

"Ten days?"

Faced with this completely different answer, Fan Zhilong smiled and said seriously: "One day!"

“？？？”

“？？？”

“？？？”

What the?

One... Time of day?

Are you sure you got it right?

"Little Fan!"

"You... Are you mistimed?" Professor Li Aimin said incredulously: "The time of the day... Isn't it possible to start counting today? Won't you know the results in the afternoon?"

"Yes!"

According to the time Xu Mang said, before half past four in the afternoon, the evidence of fragile topology will be known. Fan Zhilong said: "Although I don't know if it's true or not, according to his expression at the time, he looked a little joking." ”

Joke?

This...

I'm afraid it's true.

If Xu Mang's expression is very serious, it is worth doubting, but Xu Mang's appearance of a hippie smile needs to be noticed and taken seriously.

"One day..."

"It's... How... Maybe?" Professor Li Aimin thought for a long time, shook his head and said, "I really can't think of how to find evidence of fragile topology in one day, did he find it before?"

"Yes!"

Fan Zhilong hurriedly nodded and said: "Mr. Li, what you said is not wrong, I heard Xu Mang say that it seems to be related to graphene, he discovered this problem when he was studying graphene superconductivity before, but he didn't pay attention to it and was stolen by Oxford University." ”

Graphene again?

It's amazing!

"I think if Xu Mang finds a new theory from graphene, such as this fragile topology, he will basically win the Nobel Prize. Wang Jiafu said solemnly: "I'm not joking, the potential of this graphene has been continuously tapped by him, and there is no end in sight." ”

Hua Yanfeng smiled: "How is it true, Lao Wang, you are terrible... The Nobel laureate's teacher, this reputation is very face-saving!"

"Hehe..."

"Forget it, I don't want this kind of reputation, but... My daughter, Wang Ai, works in Xu Mang's lab, as long as she is naked. "Wang Jiafu is a father after all, and he will give priority to his children in everything, especially the future.

meanwhile

condensed matter laboratory,

Xu Mang is conducting the final experiment, and from the research team paper at the University of Oxford, he almost came up with a solution, in fact, he still relies on graphene for superposition, but this time he changed his strategy, he sandwiched graphene between two layers of tungsten diselenide, another two-dimensional material, and then released an electric field.

"Whew..."

"One last step!"

Xu Mang looked at the complex equipment in front of him, which was all completed by Xiao Man before, but now... It's up to you.

"The system... I want to get up to speed quickly on how to use this lab equipment. ”

[Recognized by the system, the current experimental equipment proficiency exchange value: 1000 (physical skills)]

Xu Mang: Embarrassed

I'm sorry

Excuse me!

What Xu Mang lacks most now is skill value, good guy... Just if you want to master the control of the device, you have to pay 1000 points of physical skills, what is this special not robbery?

Don't get tired from sleeping?

Kill and don't pay!

Five minutes later...

"It smells so good!"

Xu Mang skillfully controlled the device in front of him, and he didn't dare to think of this kind of scene before.

Set the parameters,

The computer automatically recorded the movement of the electrons at the edge of the device when the electric field changed, and Xu Mang glanced at it, which was almost this value range.

"Hello?"

"Hmm... I don't come to eat at noon. ”

"I'm in my lab, the condensed matter physics lab next to the physics building. ”

Hang up the phone,

Xu Mang glanced at the screen and found that the experiment record had been completed, and the next step was brainless calculation.

Half an hour later,

Yang Xiaoman came to the laboratory with a bag of takeaways, and saw Xu Mang sitting at the table, writing hard with a pen, and couldn't help but feel a trace of distress on his face.

A sucker...

"Alas!"

"It's time to eat. Yang Xiaoman walked to Xu Mang's side, snatched the black pen in his hand, and said solemnly: "Eat first." ”

"Oh..."

The meals brought by Xiaoman are all home-cooked series, and it is estimated that they were bought on the roadside, and they can't be burned with such a taste at her level.

"How?"

"How's the research going?" asked Xiao Man.

"It will all be done in the afternoon. Xu Mang said indifferently: "Don't buy this shrimp skin roasted winter melon in the future... There is a smell of chopped green onions. ”

“...”

"I've finished picking it for you, old lady... Do you like to eat!" Yang Xiaoman exploded in an instant, knowing that the guy in front of him couldn't eat green onions, he deliberately picked out all the green onions, but he didn't perform it, and he was accused in person.

"Oh..."

"You remember it anyway. Xu Mang said nonchalantly: "In the future, I will buy as little as possible if there are green onions, and I estimate that the child is also allergic to green onions, anyway, our family prohibits the appearance of green onions." ”

"Annoying!"

Yang Xiaoman glanced at him and said angrily: "Lady, I am so beautiful as a flower, I actually found a husband like you, God is really blind." ”

"Cut!"

"You steal the fun!" Xu Mang retorted on the spot: "It's obvious that I'm losing, you see yourself... Where am I worthy of me? I am so handsome and dashing, and so graceful..."

Words fall,

Xu Mang was beaten, but it didn't hurt at all.

Half past two in the afternoon,

Xu Mang finally solved all the problems, and his paper not only solved the fragile topology, but also deduced a completely new theory according to the characteristics of the fragile topology, which is about the field of optics.

In this brand-new theory, it may be easier for light-conducting devices to observe fragile topologies experimentally, and preliminary calculations suggest that many of the 'topology' devices proposed in photonics may be examples of fragile topologies.

Of course

All this is limited to theory, and specific situations require further experiments to draw conclusions.

"Or..."

"Will you send it tomorrow?"

...

Xu Mang had just left for less than five minutes,

Three uninvited guests came to the condensed matter laboratory, and these three are the three professors of the Department of Physics, Fan Zhilong, Li Aimin and Wang Jiafu.

"Do you think Xu Mang is in trouble?" asked Fan Zhilong.

"I don't know. ”

"He called himself Schrödingxu, so until we opened the door of the laboratory, we couldn't know what was going on inside, whether it was Xu Mang who was in trouble, or Xu Mang, who was not in trouble..."Wang Jiafu smiled: "This is Xue Dingxu's uncertainty." ”

“...”

"I think..."

Fan Zhilong was talking to Wang Jiafu while pushing the door in, and suddenly, the three of them saw a frightened picture.

What about people?

Where did Xu Mangren go?

"This..."

"What about others?"

Fan Zhilong didn't talk nonsense, and hurriedly took out his mobile phone to make a call to Xu Mang.

"Hello?"

"Xu Mang?"

"What about you?" asked Fan Zhilong.

The next second,

Fan Zhilong shouted in surprise: "What? You have already done it all?!"

Li Aimin: ???

Wang Jiafu: ???

This...

That's half a day at most, right?

......