Chapter 372

Although many people believe that graphene may realize room temperature superconductivity, there are many theoretical data supporting this view.

However...

from the point of view of the superconductivity experiment of potted chicken graphene, it is almost impossible for graphene to become a room temperature superconducting material. The concept of minus 269 degrees has completely destroyed its practical value. This experiment only shows that graphene has superconductivity.

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

"What's the matter?"

"Look at your restlessness." After dinner, Yang Xiaoman is really lying in Xu Mang's arms. After reading a micro blog, he sees Xu Mang's sad face and asks curiously, "is he worried about the cattle blowing out and falling down and being crushed to death?"

"No

"I'm thinking about the chicken sandwich bilayer graphene compound." "By inserting calcium atoms between graphene films with double-layer carbon atoms, superconductivity is realized, even though it needs to be below - 269 degrees," Xu said

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

“C6CaC6！”

"Yes, yes, yes!" Xu mang nodded: "is it the relationship between calcium atoms?"

Yang Xiaoman said seriously: "I said you are such a fool, do you only read half of your papers? The latter team inserted lithium into the bilayer graphene to replace calcium. As a result, the lithium intercalation compound did not exhibit superconductivity

"Ah?"

"Is it caused by calcium atoms supplying electrons to the graphene layer?" Xu asked in a daze.

Xiaoman shook his head: "how do I know... Or you go back to the lab now and test the data to verify your conjecture?"

"Good..."

"good ball!" Xu mang words to the mouth, noticed Xiaoman's expression, hastily changed his mouth: "put home so beautiful girlfriend does not hold, a person ran to the empty laboratory, my brain is sick?"

After that, Xiaoman was satisfied.

"I think... To find out the physical properties of superconducting graphene and its theory is what we need to do at present." After a day's training, Yang Xiaoman accumulated a lot of knowledge in this field. Chong xumang said: "we can make metal compounds, or try to change the number of graphene layers, which may lead to miracles."

Change the number of layers?

Yang Xiaoman's words provide Xu mang with different ideas, of course, all of which need to be clear about superconductivity.

At night,

came quietly.

Similar to yesterday's situation, Yang Xiaoman has a kind of unexplained irritability. Xu mang thinks that when the time is constantly decreasing, every night, Yang Xiaoman's irritability index will rise a little. If we calculate that, on the eve of the new year's Eve, Xiaoman will explode in situ.

"Ah?"

"What's your situation?" Xu mang looked at Xiaoman's face in his arms. He had a headache and said, "do you have such an expectation?"

"You mind me!"

"Idiot... Did you have a girlfriend before?" Yang Xiaoman squeaked: "how many? To what extent? "

Wait a minute!

Routine, trap, trap!

Specially dug a big hole, let oneself jump down.

Cut!

"No!"

"I'm a very pure person. I don't talk to girls except you lean on me Xu said earnestly.

Hearing Xu Mang's words, Yang Xiaoman is very angry, what is death to lean on you? Who was the one who died behind? Who's been making small moves all the time? This is to attract my attention.

"Ouch..."

"you say it!" "I won't be angry," Yang urged

Not angry?

Ha ha...

how many girls say to their boyfriends that they won't be angry. As a result, the boys say it, and then they are angry.

"Really not!"

"I really only have you as a girlfriend. I was all alone before... You think, who would like to make friends with me when I was at school Xu sighed blankly: "after all, I am so handsome, they will have pressure."

Ouch!

I want to kill him!

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

"Handsome!"

"Handsome fart!" Yang Xiaoman white one eye: "take me upstairs, I want to sleep!"

Fortunately, Xiaoman is very light. Xu mang holds her in the form of a princess and walks up the stairs.

The voice is very light,

the action is very small,

however,

however, Xu's mother opened the door and saw this scene. Her son was holding her daughter-in-law in a furtive manner. Looking at their expressions, her son's face was tense. Her daughter-in-law buried her head in her arms. From the side of her face, she looked very red!"Cough!"

"Be careful at night."

Xu's mother went down the stairs and didn't know what to do when she went to the kitchen.

"..."

"..."

"

two people that is called embarrassment.

"Ink what?"

"Are you going to wait for mom to come up and say one more word?" Yang Xiaoman raised his head and glared at Xu Mang: "open the door quickly!"

In a hurry,

Xu Mang and Xiao man came to the room and locked the door with their backhands.

This night,

was still such a toss.

...

the next day,

return to the laboratory.

Xu started the next experiment.

With the help of the quantum database, the superconductivity problem of c6cac6 is probably understood. It is really caused by the calcium atom providing electrons to the graphene layer.

"What's the matter?"

"What's the problem?" Yang Xiaoman saw Xu mang frowning, got up to help him rub the corner of his eye, said: "long term frowning will cause crow's feet."

"I think..."

"you say that graphene is a kind of hexagonal honeycomb lattice planar thin film composed of carbon atoms. It is a two-dimensional material with the thickness of only one carbon atom, but the calcium atom in the middle can realize superconductivity. What's the situation?" "There is no change, just a layer of calcium atoms," Xu asked

"..."

"I don't know." "But we can know... There are many ways to superconduct graphene," Yang said

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

"We have to look for the answer from other high-temperature superconductors..." Yang Xiaoman said, "observe the superconductivity of other superconductors and the change of quantum micro world."

"..."

alas?

Wait!

Xu mang suddenly realized that he had forgotten a certain step, which may be the key step!

The strong interaction between electrons,

that is, the highly entangled states caused by the mutual repulsion between electrons, is the key to realize superconductivity in all high temperature superconductors.

Then, Yang Xiaoman found the paper of a former physicist. Although this paper belongs to the category of prophecy, it provides a direction for their work. It says that when the rotation angle of bilayer graphene changes, electron interaction may occur.

"Fool."

"Two layers of hexagonal honeycomb like graphene, if the angle of rotation, does not produce a kind of flicker like ripple?" Yang Xiaoman pointed to the screen: "look, is this Moore pattern?"

"Nonsense!"

"When two geometrically regular patterns overlap, this is an inevitable effect."

When the voice had just dropped, Xu mang responded.

Angular rotation produces not only molars but also extended cells.

After that,

through the design of the model, Xu found that when the rotation angle of the two graphene layers changed, the ripple between the light and the dark could be clearly seen, and the smallest repeating unit of the ripple was the diamond shape.

Not only that,

Xu also found another strange feature: AA arrangement in the bright part and Ab or Ba arrangement in the dark part. In such a layout, the concept of wave crest and trough is not formed.

"Little man!"

"Is there any relevant calculation equation in that prediction paper?" Xu asked.

"Let me see..."

"yes!" Yang Xiaoman said.

"Give it to me."

"Oh..."

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

However...

Xu mang felt that there was something wrong with the calculation.

It seems to be wrong.

Because according to the above calculation results, it is impossible to make the Dirac cone of two-dimensional graphene produce energy gap, so that the Fermi velocity can be adjusted again.

"Damn it!"

"It's a beautiful mistake." Xu mang sighed and said to Xiaoman: "Xiaoman... In the next two days, we may be under more pressure."

"Ah?"

"Why?" Yang Xiaoman tooted his mouth and said unhappily, "I came to Ningshi to enjoy it. Now I feel that... I have become your tool man."

Xu mang said with a smile: "it's you who want to come, but you can't persuade me. What can I do? Forget it... Or I'll come alone, because it involves the calculation of quantum mechanics, and you may not understand it."

"Pooh!""Why can't you understand it?" Yang Xiaoman is unconvinced: "what is it?"

"The Dirac equation of quantum mechanics." "This is a quantum mechanical equation about relativity of electrons," Xu asked with a smile

"..."

listening to Xu Mang's explanation, Yang Xiaoman's face is full of confusion. What are these.

Xu mang thought for a moment and said to Xiaoman, "really... You can rest tomorrow. I can do it alone."

"No!"

"I'll be with you." Yang Xiaoman said obstinately: "don't try to drive me away, or I'll kill you!"

Xu Mang: (￣ △;)

in the end,

Yang Xiaoman stayed with Xu Mang 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 constantly calculating, writing one equation after another, but these equations themselves could not understand, even the meaning of each symbol above.

"Ah? What is this? "

"The energy gap equation."

What is this

"The solution expansion of the positive energy of Dirac electron."

"..."

Yang Xiaoman was silent.

After feeling Xiaoman's mood change, Xu mang put down his pen and asked with a smile: "what's the matter?"

"I feel like an idiot." Yang Xiaoman pursed his mouth and said helplessly: "I can't understand what you wrote. When we first met, you were stupid. Now..."

Xu mang patted his thigh and said with a smile: "sit up and I'll teach you the relativistic quantum mechanics equation of electronic motion in quantum mechanics."

Just a few minutes after sitting up, Yang Xiaoman was wrapped in happiness, and the door of the laboratory was opened.

"Cough!"

......

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