The Science Fiction World of Xueba

廷 Liu Tingbo's movement was fast. In the early morning, he called and said that he helped Pang Xuelin contact a big guy in the School of Materials Science and Engineering.

"Xiao Pang, I introduce to you the director of Jiangxi State Key Laboratory of Silicon Materials, Academician Xu Xingguo, Director of the Institute of Semiconductor Materials, and Academician Xu has been engaged in the research of semiconductor silicon materials for a long time. Materials, solar photovoltaic silicon materials, silicon-based optoelectronic materials and nano-silicon semiconductor materials. He heard that you are interested in materials science, so let me take you to see, as long as you complete the undergraduate professional courses, you can apply for him directly. Graduate students. "

Listening to the voice from the phone, Pang Xuelin couldn't help crying. Academician Xu is an expert in the field of silicon materials. If he really applied for his postgraduate exams, he would use carbon nanotubes to make carbon-based CMOS in the future. Rice bowl!

Although Xu thought so, Pang Xuelin agreed.

He is mainly good at the preparation of high-purity carbon nanotubes and two-dimensional graphene materials. If he can really convince the big man to change his career, he may not be able to develop a real carbon-based chip in the future.

"Let's go, Dean Liu, have you had an appointment with Academician Xu, when should I go to him?"

"This afternoon, he happens to be free this afternoon, we can go to the laboratory to find him!"

"Okay, that's it!"

Uh ...

At 2 pm, under the leadership of Liu Tingbo, Pang Xuelin met with Academician Xu Xingguo at the State Key Laboratory of Silicon Materials at Yuquan Campus of Jiangda University.

Academician XU Xu is over 50 years old, with a Chinese character face, thick eyebrows, and big eyes. It can be seen that when he was young, he should be a handsome man. Even at this age, his body was not out of shape and full of energy.

"Professor Xiao Pang, long known for his long name, I have long wanted to see you, but I have been on the Yuquan campus most of the time, so I have never been able to see it. I finally saw a real person today!"

Xu Xingguo got up and smiled.

Although Pang Xuelin is young, his academic status really has to be said, even above Xu Xinguo, a member of the Chinese Academy of Sciences.

After all, in China, the academician is a few hundred, and the Philippine award-winning character is Pang Xuelin.

Therefore, even for the Pang Xuelin, Xu Xingguo didn't hesitate even if the other party asked for himself.

"Professor Xu, how do you do!" Pang Xuelin smiled and shook hands with Xu Xingguo. "President Liu should have said it to you. I want to learn more about material science. I do n’t know if you are here. Convenience."

Xu Xingguo laughed: "Convenient, there is nothing wrong with me, but if you want to take my postgraduate course, you must have at least the professional knowledge of the undergraduate. I heard Lao Liu said that you have completed the self-study of the undergraduate course of materials science? "

Pang Xuelin nodded and smiled: "Yes!"

Pang Xuelin said that in fact, in those years of the wandering earth world, he did not relax his studies, especially the basic knowledge of materials science and chemistry. He learned it all, even according to his carbon nanotubes and carbon nanotubes alone. Looking at the level of the graphene field, I am afraid that no one in this world surpasses him.

Xu Xingguo laughed: "So, I have a set of papers here. If you can achieve more than 80 minutes, then I will let the School of Materials directly organize a special professional course exam for you. If you can still pass, then you will Write another graduation thesis, and the school will grant you a bachelor's degree in engineering directly. Come to my graduate school next year, what do you think? "

Pang Xuelin said: "No problem!"

行 "Okay, let's not talk nonsense, you have done this paper first!"

Xu Xingguo was clearly prepared before, and handed a paper with the fragrance of ink to Pang Xuelin.

Xi Pang Xuelin took the paper, found a place directly in the office, raised the pen to answer it.

Xu Xingguo and Liu Tingbo, who stood aside, did not speak, watching Pang Xuelin answering with interest.

虽然 Although this paper was made by Xu Xingguo temporarily, there are more than a dozen big questions, but the question type involves all aspects of the field of materials science, and the difficulty is equivalent to the examination and examination questions for materials majors, which is a comprehensive assessment of Pang Xuelin's professional knowledge.

For example, the first question is about the field of material physics.

阐述 [Describe the characteristics of the band structure of conductors, semiconductors, and insulators. 】

Pan Peng Xuelin glanced over and wrote the answer directly in the blank space.

For this basic question type, for Pang Xuelin, the answer has already been printed in his mind, and he rarely needs to think about it.

[The conductor contains underfilled bands. Under the action of the external field, the electron distribution on the underfilled bands shifts, which changes the original state of central stacking. The motion current formed by electrons occupying different states cannot be completely offset. The current formed by the offset part is the macro current. Insulators do not contain unfilled bands. The electrons in the full state will not be affected by the external field to produce a distribution that deviates from the equilibrium state. Some insulators with empty bands ...]

Second question, let Pang Xuelin explain the quantum size effect.

[Quantum size effect: When the particle size drops to a certain value ~ www.readwn.com ~ The electronic energy level near the metal Fermi level changes from quasi-continuous to discrete energy levels, and there are discontinuous highest occupied molecules in semiconductor particles The orbits and the lowest unoccupied molecular orbitals widen the energy gap, which in turn leads to different optoelectronic and superconducting properties from macroscopic objects, such as the transition of conductors to insulators, the blue shift of spectral absorption, the magnitude of magnetic moments, and the even and odd numbers of electrons related……】

Question 3: In the preparation of one-dimensional nanomaterials, a vapor-liquid-solid growth mechanism is used. Let Pang Xuelin briefly describe the basic principle of this growth mechanism.

Xi Pang Xuelin also won easily.

The next question ...

Question 5 ...

Uh ...

It took less than half an hour for Pang Xuelin to answer all the questions from Xu Xingguo.

"Professor Xu, I have finished all these questions, please take a look!"

Xu Xingguo took the book and went through it from top to bottom, and couldn't help but be a little surprised.

Although these questions are not difficult, they involve a lot of knowledge points and cover a wide range, from material chemistry, material physics, material mechanics to new functional inorganic non-metal materials, nano materials, artificial band gap materials, etc. However, Pang Xuelin not only thoroughly solved these questions within half an hour, but there were no errors or omissions in the middle, which was hard to come by.

Even some of his graduate students may not be able to do this.

This shows that Pang Xuelin has very solid professional basic knowledge in the field of materials science.

Liu Tingbo aside, a little curious: "Lao Xu, how is Professor Xiao Pang answering?"

Xu Xingguo laughed: "Professor Xiao Pang, if I hadn't seen it with my own eyes, I couldn't believe you could make a perfect score for this test paper, even some of my graduate students might not be able to do it. Here! "