Chapter 542

Three hours,

includes theory, calculation and even the following experiment. Fan Zhilong thinks that Xu mang has redefined the concept of three hours again. The original three hours can do so much and even change a prediction that lasts for more than 80 years.

In this paper, two schemes for obtaining Weyer Semimetals are obtained theoretically, one is to break the time inversion and keep the central inversion symmetry, and the other is to keep the time inversion symmetry and break the central symmetry inversion.

According to the first kind, Xu mang gave the following materials: pyrochlore structure, spinel structure, ordinary insulating material and topological insulating material; if according to the second type, Se and te crystals synthesized under pressure, BiSb and zrte, as well as Dirac semi metals, which provide evidence of the possibility of negative magnetoresistance.

According to Xu Mang's conclusion, the destruction of translational symmetry by magnetic domains and impurity atoms in the system hinders the study of the intrinsic properties of fermions in experiments, and the preparation of materials is relatively difficult.

So Xu chose the second way to find a non-magnetic material.

TAAs crystal has become the only choice,

the theory seems to be true, but it lacks too much evidence, direct evidence, digital proof.

However, his second principle calculation has solved all the previous doubts, and also runs counter to the previous theory. This material has no central inversion, but keeps time inversion symmetry, and can be synthesized naturally without any complicated and detailed control such as doping.

What's more, there is no magnetic domain and other complexity brought by magnetic materials. We can directly use the equipment for experimental observation, so as to obtain the most direct evidence.

this is...

this is the result of three hours?!

Xu mang redefined the concept of three hours.

"Xu mang?"

"Seriously... How did you do it?" "What did you do back in your apartment?" fan asked incredulously? Fortunately, I had a higher education, and then I thought you were God. "

"Ha ha..."

"you are right. I am indeed God, but I stand on the scientific point of view to understand God's thinking." With a smile on his face, Xu said with a smile: "if there is no accident, the TAAs crystal is a wail semi metal, and the prediction of more than 80 years will be broken."

"In my calculation... The lattice constants of TAAs crystal a = 3.44, C = 11.64, body centered tetragonal structure, belonging to a special space point group, lattice momentum space has 12 opposite handed fermions."

"There is an open Fermi arc on the surface and a pair of outer cones with linear cross cone energy band structure inside." "These typical electronic structures can be observed, and I get them directly from the database," Xu said seriously

Fan Zhilong did not speak and kept looking at the contents. His excitement was incomparable. If... If all this is true, then a secret of more than 80 years will be broken, and this man will be a professor from the Physics Department of Fuda University.

However...

how to prepare this high quality TAAs crystal?

"Xu mang?"

"Ah?"

"Would you make this kind of high quality TAAs crystal?"

"No

Suddenly,

there was no sound in the laboratory. They looked at each other and saw the embarrassment in each other's eyes.

This is...

after so much discussion, it is clear that neither of them will prepare this material, which means that the previous theories are all in vain. Even if the theory is correct, the calculation is accurate, and there is no real object to do research, everything is funny.

"Hello?"

"Director Liu?" "Guess who I am?" Xu asked carefully? You're right. There's no reward. "

"..."

this kind of language risks the cheap gas, uses the toe cover to think can know, is not Xu mang also can be who?

"I have caller ID!" Liu Guofang, director of the materials department, asked angrily, "what can I do for you? Listen to your tone... Seems to be in trouble. "

"Haha..."

"I just want to ask if our material system has the ability to prepare TAAs crystals?" "A high quality TAAs crystal," Xu asked in a low voice

"TAAs crystal?"

"It seems to be something about condensed matter?" Liu Guofang said solemnly, "but we should be able to prepare it. What do you want this material to do all of a sudden?"

"Don't ask!"

"Asking is changing the world." Xu mang said with a smile: "that line... It's good to be able to prepare. I'll come to your office later. Let's discuss and prepare high-quality TAAs crystals as soon as possible."

Hang up,Xu mang took a look at fan Zhilong: "yes, I'll go to Director Liu's office of the Department of materials, and I'll get this done. Then I'll use STM equipment to measure the surface electronic state with high precision, and then finish work!"

"Tomorrow."

"See for yourself what time it is." Fan Zhilong warned.

"Ouch?"

"Sleeping trough... I'm going to buy some vegetables, otherwise the female tiger in the house will have to be specially fried." Xu mang put his manuscripts into his bag and asked fan Zhilong, "Professor Fan... You said that I am a great scientist. Why am I so humiliated at home?"

"..."

"who asked you to marry Yang Xiaoman?" Fan Zhilong helplessly said: "what kind of woman you marry, you have to pay what kind of price."

The price!

It's true that Professor Fan, who has been in the scientific research field for so long, has seen the root cause of the problem directly.

Xiaoman is very self willed,

but...

Xu sighed blankly and said: "I'm not afraid of your jokes, I'll take this one."

< br.

The next day, Xu mang came to the building of Materials Department early, stood at the door of director Liu for a moment, glanced at the fruit basket in his hand, put it at the door after thinking about it carefully, and then pushed the door to enter, and saw director Liu in the office.

"Director Liu?"

"Busy?" Xu mang put on his signature smile and walked up with a cheap face and stood opposite Liu Guofang.

"..."

Liu Guofang sighed and said helplessly, "Xu Mang, your present status is not the same. Can you show me a little bit of seriousness? Scientist Xu

"It can't be changed."

"It's easy to change one's character, but one can't change it... Unless it's born again." Xu mang said with a smile: "what... Can we first talk about the things above work, and then talk about the problems of personality?"

"It's hard for you to get to the point for the first time." "Is there any relevant information?" Liu asked

"Yes!"

"Have a look." Xu mang took out a stack of paper from his bag and handed it to Director Liu Guofang.

After taking the manuscript, Liu Guofang took a look. After a few minutes, she raised her head in surprise and asked seriously, "do you say that TAAs crystal is the wail semi metallic material predicted more than 80 years ago?"

"Yes

"Basically true." Xu mang nodded: "if there is no problem in my calculation, as long as the high-quality TAAs crystal is prepared, and then I refit the STM equipment for high-precision measurement, it is appropriate!"

Liu Guofang said solemnly, "I'll arrange it right away!"

After leaving the materials department building,

Xu Mang's heart returned to peace. Director Liu Guofang promised to complete the preparation of high-quality TAAs crystal as soon as possible. The estimated time is about three days.

Three days...

almost!

Xu mang calculated the time when the announcement of the June meeting would come out, and in about a week later, the United States would issue a unilateral resolution, the so-called resolution on the launching of the so-called global compact alliance, but this organization only lacks China.

Think about it!

A broken organization is just like the real thing.

Xu mang is very disgusted with this June meeting. The most important reason is that he participated in the meeting all the time. When he saw the so-called technological hegemonism of those developed countries, he had a burning flame in his heart.

This flame is more fierce than the last time I saw Xiaoman with sheep ears and goat Cosplay clothes.

Oh?

It is said that...

Xu mang suddenly has a bold idea. He wants Xiaoman to go to the cos for Hankook. After all, the two are similar. Yang Xiaoman is the empress of the business world, while hancook is known as the Pirate Queen, but... It seems that something is wrong.

By the way!

The body aspect is fatal flaw, Xiaoman... Forget it, it's all tears!

At night,

always comes quietly,

Xu mang glances at Xiaoman who is brushing his microblog and asks carefully: "Xiaoman... Humiliated?"

Yang Xiaoman: (* ~ ＾)

it's time!

This idiot is starting again!

I'm not afraid to fight and scold. Why is this idiot so iron?

This night,

Xu mang was humiliated.

...

Institute of condensed matter,

on this day,

the research group of Weier semi metals encountered a problem. According to the theoretical results... They need to make a choice, first of all, ordinary insulator materials and topological insulator materials, and second, the solid solution which breaks the time inversion or center inversion symmetry near the phase transition of ordinary insulator and TOPO insulator.Both materials are possible, but the second one should be chosen after analysis. However, the calculation of the second one is too complicated and almost impossible to complete.

Professor Tian has been tortured to the point of collapse for this problem. All kinds of evidences point to the second kind of material, this kind of non-magnetic material. However, how to choose the right one among many non-magnetic materials needs complicated calculation.

At the same time... Reasonable deduction is also one of the conditions. Without either of these two, we can't complete this step.

Finally,

in the end, Professor Tian could only find his good friend, a domestic mathematics expert, who hoped to cooperate with him to solve this part of the problem. However, the math expert told Professor Tian that it would take at least a week.

A week?

Just a week.

When solving this problem, the team members are not idle, they need to make a variety of assumptions about the experiment, in order to facilitate the next step, can be carried out quickly.

"Say..."

"where is Professor Xu A master's degree student from Qingda asked, "will it be faster than our progress?"

"No way!"

"I have contacted my high school classmates. He is an assistant teaching assistant in Fuda University. Recently, Professor Xu has no voice. It seems that the world has evaporated." "It can't be faster than us anyway. Don't worry... I'll bet."

At this time,

a girl said, "I think you'd better be prepared mentally. Maybe it's the peace before the storm... Before the storm, it's usually peaceful, and suddenly there will be lightning and thunder."

Everyone didn't speak,

at this moment, they knew they were going to race against time.

......

www.novelhall.com , the fastest update of the webnovel!