I Don’t Want to Win Lying Down

Xu Mang felt it was understandable that everyone was not optimistic about graphene. Although many people believed that graphene might achieve superconductivity at room temperature, there were many theoretical data supporting this statement.

but...

Judging from the graphene superconductivity experiment of the foot pot chicken, it is almost impossible for graphene to become a room temperature superconducting material. The concept of minus 269 degrees has completely shattered the practical value. This experiment only shows that graphene has superconductivity only.

The challenge Xu Mang was facing now was how to obtain superconductivity in different ways.

What's wrong?

Look at how restless you are. Yang Xiaoman, who had eaten dinner, was really lying in Xu Mang's arms. He just finished reading a Weibo post, but saw Xu Mang's frowning face, and asked curiously, Yes? Are you worried that the blown cow will fall and be crushed to death?

no.

I'm thinking of the sandwich-type double-layer graphene compound of the foot pot chicken. Xu Mang said: Inserting calcium atoms between the double-layer carbon atom graphene films has actually achieved superconductivity, although it needs to be at minus 269 The degree will do.

What's the name of this compound? Xu Mang asked.

C6CaC6!

Yes, yes, yes! Xu Mang nodded, Is it related to the calcium atom?

Yang Xiaoman said seriously: I said you are a big fool, did you only read half of the paper? The latter research group inserted lithium instead of calcium between the double-layer graphene. As a result, the lithium interlayer compound did not supersede leading phenomenon.

ah?

Could it be caused by calcium atoms donating electrons to the graphene layer? Xu Mang asked in surprise.

Xiaoman shook her head: How do I know...how about you go back to the laboratory now and test the data to verify your conjecture?

good...

What a ball! Xu Mang said, noticing Xiaoman's expression, and hurriedly changed his words: Leave such a beautiful girlfriend at home and run to the empty laboratory alone, I'm sick of my mind ?”

words fall,

Xiaoman is satisfied.

I think...to find out the research and theory of the physical properties of superconducting graphene is what we need to do now. After a day of training, Yang Xiaoman has accumulated a lot of knowledge in this area, and rushed to Xu Mang's education Dao said: We can make a metal compound, or try to change the number of graphene layers, and miracles may happen.

Change the number of layers?

Yang Xiaoman's words gave Xu Mang a different way of thinking. Of course, all of this needs to figure out the nature of superconductivity.

night,

It came quietly.

The situation was similar to yesterday. Yang Xiaoman had an inexplicable irritability. Xu Mang felt that... as the time continued to decrease, Yang Xiaoman's irritability index would rise a little every night. On the night of ten, Xiaoman will explode on the spot.

well?

What's your situation? Seeing Xiaoman's happy face in his arms, Xu Mang suddenly had a headache and said, Are you looking forward to that?

Leave me alone!

Big idiot... Have you ever had a girlfriend before? Yang Xiaoman said, How many? How far?

Wait a moment!

Routine, trap, trap!

He deliberately dug a big hole and let himself jump into it.

cut!

No!

I'm very pure. I don't usually talk to girls unless you lean on me desperately. Xu Mang said seriously.

Hearing Xu Mang's words, Yang Xiaoman was very angry. What does it mean to lean on you with all your might? Who was doing everything behind his back? Who has been making small moves? Isn't this just to get my mother's attention.

Oops...

Tell me! Yang Xiaoman urged, I won't be angry.

not going to be mad?

hehe...

How many girls have said to their boyfriends that they won't be angry, but the boy just said it, and after he finished speaking, he became angry.

Really do not have!

I really only have you as my girlfriend. I was alone before... What do you think, when I was in school, who would want to make friends with me? Xu Mang sighed: After all, I am so handsome, they There will be pressure.

Whoops!

I really want to kill him!

Yang Xiaoman originally came up with an invincible reason to beat him up, but inadvertently this reason became his stepping stone.

handsome!

What a handsome fart! Yang Xiaoman rolled her eyes, Take me upstairs, I'm going to sleep!

Fortunately, Xiaoman was very light, so Xu Mang carried her up the stairs in the form of a princess hug.

very softly,

small movements,

However, I can't die... Xu's mother opened the door and saw this scene. Her son hugged his daughter-in-law, looking furtive. Looking at the expressions of the two, his son was full of tension, and the daughter-in-law buried her head In her arms, looking from the side, it seems... very red!

Ahem!

Be careful at night.

words fall,

Mother Xu walked down the stairs and went to the kitchen, not knowing what to do.

...

...

It's embarrassing for the two of them.

What's the ink?

Are you still going to wait for Mom to come up and say something? Yang Xiaoman raised his head and glared at Xu Mang: Hurry up and open the door!

hastily,

Xu Mang and Xiaoman came to the room and locked the door behind their hands.

this night,

Still so annoying.

...

the next day,

Back to the lab.

Xu Mang started the next experiment.

With the help of the quantum database, I roughly figured out the superconductivity problem of C6CaC6, and it was indeed caused by the electrons provided by calcium atoms to the graphene layer.

What's wrong?

What problem did you encounter? Seeing Xu Mang frowning, Yang Xiaoman stood up and helped him rub the corners of his eyes, and said, Long-term frowning will cause crow's feet.

I think...

You said that graphene is a planar film composed of carbon atoms in a hexagonal honeycomb lattice. The thickness is only a two-dimensional material with a thickness of one carbon atom, but superconductivity can be achieved by sandwiching calcium atoms. What does this belong to? The situation? Xu Mang asked: There is no change, just a layer of calcium atoms.

...

I don't know either. Yang Xiaoman said, But I know...there are many ways to superconduct graphene.

What do you think I should do now? Xu Mang asked.

We have to find the answer from other high-temperature superconductors... Yang Xiaoman said: Observe the superconducting properties of other superconductors and the changes in the quantum microcosm.

...

well?

etc!

Xu Mang suddenly realized, as if he had forgotten a certain step, it might be the key step!

Strong interactions between electrons,

That is, the highly entangled state caused by mutual repulsion between electrons, in all high-temperature superconductors, shows the strong interaction between electrons, which is the key to the realization of superconductivity.

Immediately afterwards,

Yang Xiaoman found a paper by a former physicist. Although this paper belongs to the category of prediction, it provided a direction for their work. The paper said that when the rotation angle of bilayer graphene changes, electrons may be generated. interaction.

Fool.

If two layers of hexagonal graphene in a honeycomb lattice are rotated at an angle, wouldn't it just produce a flickering ripple effect? Yang Xiaoman pointed to the display screen: Look, is this Moore? tattoo?

nonsense!

This is an inevitable effect when two geometrically regular patterns overlap.

As soon as the voice fell,

Only then did Xu Mang react.

The rotation of the angle produces not only moiré, but also expanded cells.

after,

Through the design of the model, Xu Mang found that when the rotation angle of the two layers of graphene was changed, the ripples between light and dark could be seen very clearly, and the smallest repeating unit of the ripples was in the shape of a rhombus.

Not only that,

Xu Mang also found another strange feature. The bright part is arranged with AA, and the darker part is arranged with AB or BA. Such a layout...doesn't exactly form the concept of peaks and troughs.

Little Man!

Are there any related calculation equations in that prophecy paper? Xu Mang asked.

Let me see...

Yes! Yang Xiaoman said.

Give me.

oh...

Xu Mang got the printed paper and checked it over and over again, especially the calculation part. According to the calculation results of this paper, when two layers of graphene are rotated, the Fermi velocity may be changed.

but...

Xu Mang felt that there was a problem with the calculation.

Seems to be wrong.

Because according to the above calculation results, it is impossible to make the Dirac cone of two-dimensional graphene generate an energy gap and readjust its Fermi velocity.

I rely on it!

This is a beautiful mistake. Xu Mang sighed, and said to Xiaoman: Xiaoman... In the next two days, we may be under a lot of pressure.

ah?

Why? Yang Xiaoman pouted, and said displeasedly: I came to Ning City to enjoy it, and now I feel... I have become your tool man.

Xu Mang smiled and said, It's you who want to come here by yourself, and you can't persuade me, so what can I do? Forget it...I'd better come alone, because it involves calculations of quantum mechanics, you may can't read.

Pooh!

Why can't you understand? Yang Xiaoman was not convinced: What is it?

The Dirac equation of quantum mechanics. Xu Mang asked with a smile, This is a relativistic quantum mechanics equation about electrons.

...

Listening to Xu Mang's explanation, Yang Xiaoman's face was full of confusion at this moment, what and what was it all about.

Xu Mang thought for a while, then said to Xiaoman, Really... You can rest tomorrow, I can do it by myself.

don't want!

I want to accompany you. Yang Xiaoman said stubbornly: Don't try to drive me away, or I will kill you!

Xu Mang: (￣△￣;)

finally,

Yang Xiaoman was still by Xu Mang's side and became a tool man.

Of course...she doesn't have to do anything.

make a mascot,

decoration,

vase.

In the following time, Yang Xiaoman watched Xu Mang keep calculating, writing one equation after another, but he couldn't understand these equations, and he didn't even know the meaning of each symbol above.

Huh? What is this?

The energy gap equation.

Then what is this?

Solution expansion for the positive energy of the Dirac electron.

...

Yang Xiaoman was silent.

After feeling Xiaoman's emotional change, Xu Mang put down the pen in his hand and asked with a smile, What's wrong?

I feel like an idiot. Yang Xiaoman pouted, and said helplessly, What you wrote...I couldn't even understand it. When we first met, you were so stupid. Now...

Xu Mang patted his thigh and said with a smile on his face, Sit up by yourself, and I will teach you the relativistic quantum mechanics equations of electron motion in quantum mechanics.

Just a few minutes after sitting on it, Yang Xiaoman was surrounded by happiness, and the door of the laboratory was opened.

Ahem!

 …

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