I Don’t Want to Win Lying Down

Three hours,

Including theoretical aspects, calculation aspects, and even the next experimental part, Fan Zhilong felt that Xu Mang had redefined the three-hour time concept again. It turned out that three hours could do so much content, and it would even change an eight-hour period. Ten years of prophecy.

In this paper, first of all, two schemes for obtaining Weyl semimetals are obtained theoretically. One is to break the time-reversal and maintain the central inversion symmetry, and the other is to maintain the time-reversal symmetry and break the central symmetry. play.

According to the first type, Xu Mang gave the materials of pyrochlore structure, spinel structure, common insulating material, and topological insulating material; if according to the second type, Se and Te crystals synthesized under pressure provide negative BiSb and ZrTe, and Dirac semimetals, evidence of magnetoresistance possibility.

According to Xu Mang's conclusion, due to the magnetic domains brought by the magnetic atoms in the system and the destruction of translational symmetry by impurity atoms, the research on the intrinsic properties of Weyl fermions in the experiment is hindered, and the preparation of materials is relatively difficult.

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

TaAs crystal has become the best choice,

The theory seems to be true, but there is not much evidence, that kind of direct evidence, numerical proof.

And his second principle calculation solved all the previous doubts, and also ran counter to the previous theory. This material has no center inversion but maintains time-reversal symmetry, and can be synthesized naturally without mixing. Miscellaneous and other detailed and complicated regulation.

More importantly, there is no complexity such as magnetic domains brought by magnetic materials, and the equipment can be directly used for experimental observation, which is convenient for obtaining the most direct evidence.

this...

This is the result of three hours? !

Xu Mang redefines the concept of three hours.

Xu Mang?

Seriously...how on earth did you do it? Fan Zhilong asked in disbelief: What did you do back in your apartment? Fortunately, I received higher education, and then I thought you were God.

hehe...

You are right, I am God,

It's just that I stand on a scientific point of view to understand God's thinking. Xu Mang said with a smile on his face, If nothing else happens, TaAs crystals are Weyl semimetals, and the 80-year-old prophecy is about to be broken.

In my calculations... the lattice constants of TaAs crystals are a=3.44, c=11.64, and it has a body-centered tetragonal structure, which belongs to a special space point group. There are 12 Weyl fermions with opposite chirality in the lattice momentum space. .”

There are open Fermi arcs on the surface, and there are pairs of Weyl cones with linear cross-cone band structures inside. Xu Mang said seriously: These typical electronic structures can be observed, and I directly from the database.

Fan Zhilong didn't speak, he kept looking at these contents, and the excitement in his heart was unparalleled. If...if all this is true, then a secret that lasted more than 80 years will really be broken, and this person will be Professor from Fuda Physics Department.

but...

How to prepare such high-quality TaAs crystals?

Xu Mang?

ah?

Will you make this high-quality TaAs crystal?

No way!

suddenly,

The laboratory was silent, and the two looked at each other, seeing the embarrassment in each other's eyes.

this...

After discussing so much and speaking clearly and logically, neither of them knew how to prepare this material. This means that the previous theories are all for nothing. No matter how correct the theory is, no matter how accurate the calculation is, it is all ridiculous without real objects to do research on.

Hello?

Director Liu? Xu Mang asked cautiously, Guess who I am? There is no reward for guessing right.

...

This kind of speech is so cheap that you can know it with your toes. Who else can it be if it's not Xu Mang?

I have a caller ID! Liu Guofang, director of the Department of Materials, asked angrily, What can I do for you? From your tone... it seems that you have encountered some trouble.

hey-hey...

I just want to ask if our material department is capable of producing TaAs crystals? Xu Mang asked in a low voice, A high-quality TaAs crystal.

TaAs crystal?

This seems to be something related to condensed matter? Liu Guofang said seriously: But we should be able to prepare it. What do you suddenly need this material for?

Do not ask!

Ask is changing the world. Xu Mang said with a smile, That's fine... as long as it can be prepared, I'll come to your office later, let's discuss and prepare high-quality TaAs crystals as soon as possible.

hang up,

Xu Mang glanced at Fan Zhilong: It can be prepared. I'll go to Director Liu's office of the Materials Department to finish the matter. Then, I will use STM equipment to measure the surface electronic state with high precision, and call it a day!

Tomorrow.

See for yourself what time it is. Fan Zhilong reminded.

Ouch?

Damn it...I'm going to go shopping, or the tigress at home will go crazy. Xu Mang put his manuscript in his bag and asked Fan Zhilong, Professor Fan...you Say I am a great scientist, why am I so humiliated at home?

...

It was Yang Xiaoman who asked you to marry. Fan Zhilong said helplessly, You have to pay a price for what kind of woman you marry.

cost!

As expected, Professor Fan, who has been in the scientific research world for so long, hit the nail on the head... directly saw the root of the problem.

Xiaoman is very capricious,

but...

Xu Mang sighed, and said with a look of unrequited love, I'm not afraid of making fun of you when I say it, so I'm fine with it.

words fall,

leave in a hurry.

the next day,

Xu Mang arrived at the Department of Materials Building early, stood at the door of Director Liu for a while, glanced at the fruit basket in his hand, thought about it carefully, and put it at the door, then pushed the door open and saw Director Liu in the office.

Director Liu?

Busy? Xu Mang put on his signature smile, walked up with a mean face, and stood opposite Liu Guofang.

...

Liu Guofang sighed, and said helplessly, Xu Mang...Your status is different now, can you show a little seriousness as you should? Great scientist Xu?

It can't be changed.

The country is easy to change and the nature is hard to change. You can't change it... unless you reincarnate again. Xu Mang smiled and said, Then what... can we talk about work first, and then talk about personality? question?

It's rare for you to get straight to the point for the first time. Liu Guofang asked, Do you have any relevant information?

have!

Look over it. Xu Mang took out a stack of manuscript paper from his bag and handed it to Director Liu Guofang.

After receiving the manuscript, Liu Guofang glanced at it. After a few minutes, she raised her head in surprise and asked seriously: You said that TaAs crystal is the Weyl semimetal material predicted more than 80 years ago?

right!

Basically true. Xu Mang nodded: If there is nothing wrong with my calculation, as long as I prepare a high-quality TaAs crystal, and then use my modified STM equipment for high-precision measurement, it will be fine!

Liu Guofang said seriously: I'll arrange it right away!

Leaving the Department of Materials Building,

Xu Mang's heart returned to calm. Director Liu Guofang promised to complete the preparation of high-quality TaAs crystals in the fastest possible time. The estimated time is about three days.

three days...

Almost there!

Xu Mang calculated when the announcement of the June meeting would come out, and it would be released in about a week. The United States unilaterally decided to start the so-called Global Condensed Matter Alliance, and this organization lacked only Huaguo.

Just think about it and get angry!

A shitty organization that looks like the real thing.

Xu Mang was very disgusted with this June meeting. The most important reason was that he participated in it all the way. Seeing the so-called technological hegemony of those developed countries, a flame burned in his heart.

This flame is more ferocious than the last time I saw Xiaoman wearing sheep's ears and goat's clothes.

well?

By the way...

Xu Mang suddenly came up with a bold idea. He wanted Xiaoman to cosplay Hancock. After all, the two are similar. Yang Xiaoman is the queen of the business world, and Hancock is called the Queen of Pirates, but... .. something feels wrong.

correct!

Body is the fatal shortcoming, Xiaoman... Forget it, I will cry if I talk too much!

night,

always come quietly,

Xu Mang glanced at Xiaoman, who was scrolling Weibo beside him, and asked cautiously, Xiaoman... humiliated?

Yang Xiaoman: (*￣︿￣)

here we go!

The idiot is at it again!

He is really not afraid of being hit, nor is he afraid of being scolded. Why is this idiot so stubborn?

this night,

Xu Mang was very humiliated.

...

Condensed Matter Institute,

this day,

The research team of Weyl semimetals 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, near the phase transition of ordinary insulators and topological insulators, breaking the time reversal Or a solid solution with central inversion symmetry.

Both materials are possible, but the second one should be chosen after analysis, but... the calculation of the second one is too complicated, almost an impossible thing to do.

Professor Tian has been tortured to the point of collapse for this problem, and all kinds of evidence point to the second material, this non-magnetic material, but how to choose correctly among many non-magnetic materials requires complex calculations to get the result .

At the same time...reasonable deduction is also one of the conditions, without any of these two, it is impossible to complete this step.

finally,

Professor Tian could only find his friend, a domestic mathematics expert, hoping to cooperate with him to solve this part of the problem, but the mathematics 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 various assumptions about the experiment so that they can be carried out quickly in the next steps.

Say...

Which step has Professor Xu reached? A master student from Tsinghua University asked, Will it be faster than our progress?

impossible!

I have contacted my high school classmate. He is a teaching assistant at Fuda University. Recently, Professor Xu has not heard from him. It seems that the world has disappeared. A science graduate student said: In short, it is impossible to be faster than us, don't worry. Well... I bet.

At this time,

A girl said: I think everyone should be mentally prepared. Maybe this is the calm before the storm... Before the storm, there is usually no problem, but suddenly there will be lightning and thunder.

no one spoke,

At this moment they knew that they were going to race against time.

 …

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