"Xu Mang?"

"What the hell is going on?"

"You... I remember you weren't working on axes?"

After being surprised, there was endless confusion, Fan Zhilong asked curiously: "Why did you suddenly study Weyl semimetals? And this Weyl semimetals are not simpler than your shaft, this theory was proposed more than eighty years ago." ”

Faced with this situation,

Xu Mang just smiled indifferently and said silently: "Actually... I found out that Weylic fermions may be related to axions, and I want to prove Weylic fermions first, and then look for axions based on the existence of Weylic fermions. ”

"You..."

"You have to solve three problems at once. Fan Zhilong said helplessly: "Crossing from condensed matter to high-energy particles has almost created three miracles. ”

"It's okay. ”

"But... Who knows. Xu Mang said with a smile: "They are all illusory things, how difficult it is to find them, but Weyl Fermi and Weyl semimetals, there are relevant theoretical supports, but the shaft is a simple prediction." ”

"That's right..."

"Professor Fan, do you think the physical properties of the Weyl semimetals that I speculated are in line with its Weyl fermion state?" asked Xu Mang.

Fan Zhilong shook his head and said seriously: "Give me half an hour, I need to take a good look at the content, I just took a look." ”

"Hmm!"

"By the way, I'll have breakfast. Xu Mang smiled and took out a ball of rice, and then sat in the corner and began to eat, his ball of rice was relatively simple, with only a fritter in it, and then sprinkled a little salt.

However, the more simple the thing, the more delicious it tastes, and Xu Mang almost felt the absolute balance between glutinous rice and fried dough sticks.

At this point,

Professor Fan Zhilong began to read the manuscript of this paper, and the previous ones were all normal things, a solution derived from the Dirac equation, according to the quantum theory explanation, Weyl fermions are not elementary particles.

To be precise, Weyl fermions exist in the form of quasiparticle excitation in condenser physics.

Followed by

Professor Fan saw a miraculous transformation, and from the existence of Weyl fermions, he deduced the physical phenomena that Weyl semimetals might present, and according to the three characteristics given by Xu Mang, Weyl cones, Fermi arcs and chiral anomalies, Fan Zhilong vaguely associated a material.

He had encountered this kind of material before, but because it was too strange and too difficult to study, it was directly abandoned.

"Xu Mang?"

"I know of a material that fits the physical phenomenon you predicted. Fan Zhilong said seriously: "Once upon a time... When I was working on the Dirac electronic states of topological semimetals, I came up with an idea based on the Dirac theory of semimetallic materials. ”

Xu Mang was stunned for a moment and looked at him with a surprised face.

"I was thinking... What kind of metal would it be if the topological semimetal was to be degenerated by uncoupling the spin on its Dirac cone and splitting into a chiral Weyl cone?" Fan Zhilong said: "At that time, I didn't know what kind of material this was, but after reading your speculation about the Weyl semimetal, I found out... Probably Weyl semimetal!"

it!

Seem... It seems to be the case!

By analyzing the hints given by Fan Zhilong, Xu Mang found that as long as the topological semimetals were changed, the so-called Weyl semimetals could appear.

"Holy!"

"Professor Fan... You're awesome!" Xu Mang said with a smile: "What kind of material is it?"

"I don't know. ”

"I mean, according to the topology, the semimetal changes the structure, and what material is after the change... I do not know. Fan Zhilong said helplessly: "It is not easy to realize Weyl semi-metal by breaking the inversion symmetry of time or space. ”

truly

It's not easy!

According to Xu Mang's rough guess at the scene, Fan Zhilong's bold guess was to reverse the symmetry by introducing magnetic atoms to break time, or to realize the Weyl electronic state by continuously doping the control components and band structure.

But...

The magnetic domains brought by the magnetic atoms in the system and the destruction of the translational symmetry of the atoms will hinder the intrinsic properties of Weyl fermions.

How to realize the Weyl electronic state by breaking the space inversion symmetry without the need for doping and other delicate and complicated control is the most critical factor at present.

“...”

“...”

The two stared at each other with wide eyes, looking at each other, and the current situation was really embarrassing.

This question seems to be unsolvable!

"Xu Mang..."

"That's all I can help, it's up to you. Fan Zhilong said: "Speaking of Weyl semi-metal material system, it is a research that has been very popular in condensed matter physics, and many people are involved in it. ”

Xu Mang nodded, the Weyl fermion state is most likely to appear in condensed matter matter.

Pity...

How difficult it is.

Leaving the lab,

Xu Mang came to the computer building slowly, and used the materials science database to carry out a series of deletions according to the three speculative materials, but the answer was no, which was another serious blow to Xu Mang.

What to do?

Back to the apartment,

Xu Mang faced this problem with a systematic exploration, and finally felt that it was still necessary to go through the principle calculation, and find the materials that meet the properties from the principle calculation, whether it can be realized... I'll talk about that later.

...

"Hua Lao!"

"Do you know what Xu Mang has been doing lately?" Fan Zhilong found Hua Lao and said with a serious face: "He switched from your particle physics to condensed matter physics. ”

"What?"

"He... He doesn't study the shaft anymore?" Hua Yanfeng asked with a confused expression: "What is the situation? Is it that Xu Mang thinks that the shaft is impossible to be discovered?"

Fan Zhilong shook his head and said seriously: "It's not like that... Rather, it's the only way to find the shaft. ”

Hua Yanfeng hurriedly asked, "What is the situation?"

Xu Mang thinks that Weyl fermions may be related to shafts, but if you want to prove Weyl fermions, you need to find Weyl semimetals, and I read his manuscript this morning and found that his research on Weyl semimetals is quite detailed. ”

Although Hua Yanfeng is a professor of particle physics, he also knows a little about other aspects, such as this so-called Weyl semimetal.

This... It's not easier than an axle!

Even with equations and relative solutions, it is still difficult to implement.

"This..."

"I can't imagine that the study of one axis will involve so many things. Hua Yanfeng said helplessly: "It is estimated that he will be busy during this time. ”

"Hehe..."

"It's not just busy. ”

"I estimate that Xu Mang is already in a state of anxiety now. Fan Zhilong smiled bitterly: "First of all, we must find the Weyl semimetal, secondly prove the existence of Weyl fermions, and finally explore the shaft according to Weyl fermions." ”

“...”

Hearing Fan Zhilong's words, Hua Yanfeng didn't know how to speak for a while, and there were twists and turns... What should I do?

This question,

Hua Yanfeng thought about it and decided to find Fang Jun first, the best physics department could provide Xu Mang with a little help, let him do so many things alone, it is estimated that in less than a year, people will become stupid.

moment

Hua Yanfeng found Fang Jun and told the head of the physics department about Xu Mang's current situation.

"This question..."

"All I can say is that there is nothing I can do. Fang Jun shook his head again and again: "It's not that the department doesn't want to support Xu Mang, it's that the limited ability can't help at all, and the research on Weyl semimetals has never been proposed, including Weyl fermions and shafts in the back." ”

"All we can offer is money and equipment. Fang Jun said: "Or... I asked the academicians of the Academy of Sciences? I wonder if they helped us with Weyl semimetals. ”

Words fall,

Fang Jun picked up the landline receiver and dialed a certain number.

Soon the number went through.

"Hello?"

"Old Ji... It's our horse. Fang Jun asked indifferently: "You are an authority on condensed matter physics, do you know about this Weyl semimetal?"

moment

There was silence on the other end of the phone, and there was no speech for a long time.

"Fang Jun..."

"What are you doing in the Department of Physics at Fuda University?" the person on the other end of the phone said curiously, "I happened to collide with my team, so how far have you been researching?"

"What?"

"You... Old Ji... You can't be lying to me, are you?" Fang Jun said in shock, "You are also researching Weyl semimetals?"

"Yes!"

"The Institute of Condensed Matter of our Academy of Sciences, together with the three universities of Qingdao University and Peking University of Science and Technology, has jointly studied Weyl semimetals, and has completed the theoretical part and will soon conduct experiments. The man named Lao Ji said, "What progress have you reached?"

Time

Fang Jun didn't know how to explain this situation, the research institute under the Academy of Sciences joined forces with Qing University and Peking University of Science and Technology to jointly study Weyl semimetals, which... Isn't this closing Xu Mang to a dead end again?

"Nothing..."

"We're just getting started, and since you're working on it, let's cancel the project. Fang Jun said indifferently.

When Lao Ji heard Fang Jun's words, he hurriedly said, "Is it Xu Mang?"

“...”

"It's not!"

"There's something else on my side, so I'll hang up first. ”

Fang Jun didn't give Lao Ji a chance to speak, and hung up the call directly.

"What's the situation?"

"Over there... Also working on Weyl semimetals?" Hua Yanfeng asked.

"The situation... The situation is bad. Fang Jun said helplessly: "The Institute of Condensed Matter under the Academy of Sciences is combined with the three universities of Tsinghua University and Peking University of Science and Technology. Xu Mang was really born at the wrong time. ”

The research institute under the scientific research plus three top universities in China, and Xu Mang is the only one here...

The gap between the two is too big, right?

"Actually, that's fine. ”

"Let Xu Mang take a break. Fang Jun didn't care much about this, but he felt that it was a good thing for Xu Mang, and he could take this opportunity to relax, he pressed too hard alone... It is easy to have an accident, and even a nervous breakdown.

"yes!"

"Who is going to study instead of research? On the contrary, I think it is more appropriate for Xu Mang to take a break. Hua Yanfeng said with a smile.

After Hua Yanfeng left,

Fang Jun immediately called Xu Mang and told him some realistic situations.

"Hello?"

"Xu Mang?"

"Are you studying Weyl semimetals?" Fang Jun said: "Forget it, the Institute of Condensed Matter under the Academy of Sciences, and the three universities of Qing University, Peking University and University of Science and Technology, are studying Weyl semimetals together, and now they have completed the theoretical framework, you can take a break, don't force yourself too tired." ”

"What?!"

"You've completed the theoretical framework as well?"

Hearing Xu Mang's reply,

At this time, Director Fang Junfang looked at a loss.

......

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