"We all know that an atom is composed of an outer electron shell and a nucleus."
"As for the atoms we draw on the drawings, although they are all round and look like a solid ball, in fact, they have no shell."
"Just like our solar system, the planets are electrons and the sun is the nucleus, each with its own orbit."
"Of course, the two are slightly different. After all, multiple electrons can coexist in the same orbit, but our planet obviously cannot."
"However, the biggest difference is that atoms can be connected to each other. Our sun is different. It will not be connected to other stars. Of course, this is not absolute. When billions of
Years from now, when the Milky Way and Andromeda collide, maybe our sun will be connected to other stars."
"Of course, this matter is still too far away from us. Back to the overall situation, when atoms are connected to each other, the electrons between them form a connection point. Do you know the James train hook? It is used
When the electrons are connected together in the carriages of the train, it is like a train hook connected together, except that the train hook is stronger, stronger than the chemical bond between electrons."
"As for the atoms on both sides of the electron, obviously there is more than just one connection. Even the simplest hydrogen gas is a connection formed by two electrons. And with so many connections, our atoms look like one thing -"
"Kink!"
"As for why I use kink to describe them, here, let us return to the kink theory."
"..."
In the lecture hall of the Institute of Physics of the Chinese Academy of Sciences, Lin Xiao stood on the stage and gave a report on the theory of electronic topological bonding. The lecture hall was already full of people, even in the aisles.
Among them are some of the top physicists in the country and some who are not top-notch. Likewise, there are also a lot of graduate students from the Institute of Physics and people who come from other places for their reputation.
Lin Xiao's first report on the theory of electronic topological bonding was one that no one wanted to miss.
As Lin Xiao began to talk and gradually entered the content, the graduate students, intern researchers, assistant researchers, etc. all showed moved eyes.
Master's student A: "I was so moved, I actually heard Lin Shen's report!"
Master's student B: "I was ready to go back and watch the video. I didn't expect Lin Shen to say it so vividly."
Doctoral student: "Shen Lin really takes good care of us!"
Intern researcher: "When I go out from now on, I can boast that I understood Lin Shen's report."
However, just when they were moved by themselves, Lin Xiao on the stage suddenly said: "So here, we need to use some knowledge in topology. I will briefly explain it to you from the perspective of mathematics."
Then I picked up the pen and wrote the formula on the blackboard.
"SH2≌Z/2Zx(T*T)......"
At this time, when the graduate students and ordinary researchers who felt that they were finished looked up again, they were stunned.
Master's student A: "What is this? You call this simple?"
Master student B: "I take back what I just said."
Others:╥﹏╥
After all, the theory of electronic topological bonding is discussed using mathematics. If you do not use mathematics when reporting, it will definitely not work.
Of course, Lin Xiao did not just continue to use mathematics to explain. After simply using mathematics to demonstrate a point, he started to explain it in a more understandable way.
However, just when the graduate students present thought that the "Book of Heaven Moment" was over, Lin Xiao suddenly began to use mathematical methods to discuss a key thing, so they could only fall into confusion and spend it again.
This is the "book moment".
In this way, with Lin Xiao using very complicated mathematics to explain a point from time to time, the report ended after about an hour.
Warm applause rang out, but except for the top physicists who could still understand and finish it, the other less top physicists and others could only follow the crowd with a look of confusion.
Get started.
Then, several senior officials from the Institute of Physics walked up and took a group photo with Lin Xiao.
After the group photo was taken, Director Fang Zhong smiled and said: "Professor Lin is really amazing. This electronic topological bonding theory is of great significance to our condensed matter."
Lin Xiao smiled and said: "There are many theories in condensed matter physics, and my theory can only play a small role."
Fang Zhong shook his head with a smile: "If your role is small, then we probably don't have any important theories in condensed matter physics. I myself study the theory of topological electronic states. After reading the paper on the topological bonding theory of electrons,
, I was shocked at the time, and I have been studying your theory ever since."
"Haha, it is an honor for me to have an academician specialize in studying my theory."
Lin Xiao smiled.
"Hey, what's the honor? I'm lucky to be able to study this theory. If I didn't have this theory, where would I go to study the truth of our condensed matter physics?" Fang Zhong waved his hand and said with a smile:
"By the way, you came here with the intention of visiting our superconducting laboratory? How about we go now?"
"good."
Lin Xiao couldn't wait any longer and responded immediately.
Afterwards, Fang Zhong led Lin Xiao to their superconducting laboratory.
Superconductors are one of the most important research directions in condensed matter physics. Basically any condensed matter physics institute will have such a superconducting laboratory.
The Superconductivity Laboratory of the Institute of Physics is also a national key laboratory, with as many as thirteen academician researchers working in this laboratory.
Including Zheng Cheng and Xu Yan, they were also transferred here as researchers.
After Fang Zhong brought Lin Xiao to the laboratory, Academician Zhao Xian, director of the Superconducting Laboratory, came to greet Lin Xiao in person.
Zhao Xian has been engaged in superconducting research for many years and has won the Mathias Prize, an important award in the field of superconducting physics. He has made many contributions to the research of superconducting physics.
After getting to know each other, Zhao Xian took Lin Xiao around here, "Professor Lin, you have finished studying the lithography machine, and now you are suddenly interested in our superconductors?"
"Haha, I believe there is no physicist who is not interested in superconductors. It's just a matter of priority."
Lin Xiao replied with a smile.
"That's true."
Zhao Xian immediately smiled.
The physical theory hidden in the superconducting state has a fatal temptation for every physicist. For example, the three physicists who proposed the BCS theory to explain the principle of low-temperature superconductivity all won the Nobel Prize in Physics.
Prize, and if someone can find the principle that explains high-temperature superconductivity, then he will definitely win the Nobel Prize in Physics.
So every physicist is hungry for this.
"But unfortunately, there are fewer and fewer people who are still willing to study superconductivity."
Speaking of this, Zhao Xian shook his head and sighed, "Our laboratory used to have many young people coming in every year, but now there are fewer and fewer."
Lin Xiao said nothing and stopped in front of a laboratory.
High Temperature Superconductivity Laboratory.
As a national key laboratory, the Superconductivity Laboratory obviously does not mean that there is only one laboratory, but consists of many different laboratories, and this high-temperature superconductivity laboratory is one of them.
The so-called high-temperature superconductivity and room-temperature superconductivity, the high temperature of the former is relative to the low-temperature superconductor with a Kelvin temperature below 77K. As long as the temperature required to maintain the superconducting state is higher than 77K, it can be called high-temperature superconductivity. As for room temperature,
Superconducting is a superconductor that can achieve superconducting at room temperature, and this temperature is obviously much higher than 77K, because the room temperature needs to be 273.15K, which is above 0 degrees Celsius.
"Go in and take a look?" Zhao Xian said.
"Um."
Lin Xiao nodded, and then walked in with Zhao Xian.
After entering, the ambient temperature seemed to have dropped a bit. There was a lot of space inside, and it was also a bit messy.
As for the reason why it looks messy, the main reason is that there are many circuits inside and a huge instrument in the middle.
Looking at this thing, Lin Xiao couldn't help but raise his eyebrows and said, "This is the angle-resolved photoelectron spectrometer?"
"Yeah." Zhao Xian smiled and said, "ARPES, which specializes in solid state physics, can be used to analyze electronic structures."
Lin Xiao nodded: "I will have to renovate one for my research institute later."
Zhao Xian: "..."
You know your institute has money, but don't show it off.
Without saying much, Zhao Xian took Lin Xiao to the computer next to him and began to introduce him to how to use ARPES.
Lin Xiao naturally mastered it quickly. For him, this was not a problem, not to mention that with his current brain development, it was completely easy to understand.
Seeing that Lin Xiao must have understood, Zhao Xian did not doubt whether Lin Xiao really understood, so he started ARPES directly. Then, first, deep ultraviolet light was emitted from the light source system, and finally hit the material.
The electronic structure of the material is then detected through the photoelectric effect.
Because of this effect, ARPES is also called "a microscope that can see the electronic structure."
Soon, items of data appeared in front of them.
"What we are testing now is yttrium barium copper oxide, which is now in a superconducting state. From the analysis of these data, we can see its electronic structure."
Zhao Xian said, then looked at Lin Xiao beside him.
Lin Xiao touched his chin at this time, with a thoughtful look on his face, and said, "Isn't this critical current density a bit low?"
"Did you see it?" Zhao Xian was stunned for a moment. Can you tell this from these data?
"Well, according to the electronic topological bonding theory, the critical current density of the structure reflected by this data must be very low."
Lin Xiao's answer made Zhao Xian give a thumbs up.
"sharp!"
Lin Xiao didn't say anything, but continued to look at the data, frowning and said: "But... if the structure is changed, it seems to be a little different."
