Through the experimental study of condensed matter substances such as LaAlO3/SrTiO3 heterointerface, amorphous alloy Zr41.2Ti13.8Cu12.5Ni10Be22.5, thermogenic phase change metal oxide vanadium dioxide, etc., Yang Dingtian collected a large number of experimental data and handed them to Shen Qi to construct a theoretical system.

Yang Dingtian takes the laboratory as his home, except for going back to the dormitory to take a hot bath, he eats, drinks and sleeps in the Shen Qi Mathematics and Physics Research Center.

Shen Qi finally understood why Yang Dingtian wanted to raise a cat, Yang Dingtian, an abstinent experimental madman, needed the companionship of a healing small animal, otherwise he would be too lonely.

Based on the data from the laboratory, Shen Qi began to draft a review article, in which he took LaAlO3/SrTiO3 as an example and identified the origin mechanism of the quasi-two-dimensional electron gas q2DEG with high concentration and high mobility at the heterogeneous interface as polarization catastrophe.

The polarization catastrophe theory was not proposed by Shen Qi, but he verified the theoretical support of the polarization catastrophe theory on q2DEG in his own way.

After the verification, what are the practical applications?

Shen Qi wrote in the review article that new oxide materials may be invested in the future research and development and manufacturing of electronic devices, and the traditional electronics industry may usher in new changes.

For the study of vanadium dioxide, another oxide, vanadium dioxide (VO2), Shen Qi boldly proposed a new speculation on the basis of certain experimental data and computer simulation data, combined with the classical theoretical system of defect topology and geometric properties, which he tentatively called "the disordered-ordered phase transition rule of compounds with multiple crystalline phase structures".

VO2 is a typical compound with a variety of crystalline phase structures, and at 341K, that is, 67.85 degrees Celsius, VO2 will undergo a reversible change from low-temperature insulator phase to high-temperature metal phase, accompanied by reversible mutation of optical, electrical, magnetic and other properties.

This unique property makes VO2 have a wide range of application prospects in the fields of optoelectronic material switches, smart glass, storage media materials, laser protection, etc.

The metal-insulating reversible phase transition of compounds like VO2 has always been a hot topic of research by scientists, but the mechanism of the phase transition has not yet been determined.

Shen Qi found that the macroscopic physical phenomena of compounds with a variety of crystalline structures are determined by their microstructure characteristics, and a large number of ordered core regions will be formed in the early stage of phase transition, and the core will continue to grow during the phase transition process and lead to mutual contact, and the interweaving of antiphase domains is disordered.

After rigorous topological analysis, Shen Qi speculated that the formation of superlattices is the result of ordering, which is conducive to controlling the metal-insulating reversible phase transition, which theoretically follows a one-dimensional lattice model.

Through tireless mathematical and physical calculations to optimize the calculation method of lattice dynamics, Shen Qi gave the basic equation of this model:

∫+∞-∞dux/dx/x-ζdζ=（1-v）b/2asin4πux/b

"I'm tired, it's too brain-burning. Shen Qi conceived for a few months, recruited a doctoral student to help him do experiments day and night, and finally wrote a review article of more than 50 pages.

More than half of the content of this article is filled with various experimental data, charts, and pictures, a small half is theoretical analysis and speculation, and the conclusive content is the final basic equation.

Shen Qi asked Yang Dingtian to come to the director's office to enjoy his freshly released review article together.

Yang Dingtian came in with a cat, and after seeing Shen Qi's masterpiece, Yang Dingtian was shocked: "It's too good, Director Shen, with a mere 5 million funds, you just made up research results worth more than 5 billion." ”

The cat was also shocked: "Meow!"

"Dingtian, this is also your credit, I want to say that this is only a phased research result, and your experiments will continue. This rule, which I have repeatedly verified, is only applicable to partial oxides and complex oxides, even for structurally similar alloys. Shen Qi touched the cat's chin and said, "This cat has grown fat again, it seems that the treatment of our center is good." ”

"So Director Shen will publish this review article?" Yang Dingtian asked.

Shen Qi converted the review article into PDF format and entered the submission page of Physical Review Letters: "Publish. ”

"Is there still my name in the list of authors?" Yang Dingtian's body shook, and he could see the excitement in his heart, and many doctoral students dare not think about this kind of thing when he can become the author of a PRL paper at the reading stage.

"I wrote the article, the experiment was basically done by you, and your name must be on the list of authors. Our 973 project is a series, and this review article is part of the series, and as the experiment progresses, we will publish a sequel and a side story in the future. Because you've just come.,So the opening article of this series is written by me.,I hope you can grow up as soon as possible.,The sequel later.、You'll be the main writer.,I'm in charge of review.。 After Shen Qi finished submitting the review article, he forwarded the PDF file to Yang Dingtian's mailbox.

After finishing the matter, Shen Qi handed over some sketch paper manuscripts to Yang Dingtian: "PDF is the presentation of the results, these manuscripts represent the thinking process, you take it back and study it, if you don't understand anything, you can ask me." ”

Shen Qi has his own set of methods for taking doctoral students, and doctoral students cannot be treated as wage earners and experimental dogs, and imparting experience and knowledge is the most important thing.

Yang Dingtian took the manuscript and found a treasure, and he also put forward a suggestion: "Our previous experiments are mainly to provide data support for theoretical construction. For example, based on Director Shen's disorder-ordered phase transition rule, we have obtained the commercial application data of reversible phase change of vanadium dioxide through experiments, which can be applied to many industries such as construction, electronics, automobiles, high-tech industries, and even military industry. This thing is a patent, and the wider the application and the higher the value, the more valuable it is. ”

"I understand the reason, but do you think that with just 5 million, so a few basic equipment, we can complete commercial research and development? Of course, in the early stage, we can find some partners with strong financial resources through industry-university-research cooperation, and later our center has developed and expanded, and we can do it alone. But no matter how much we do it alone, we will not directly face the market, market competition is the responsibility of enterprises, universities and scientific research institutions are responsible for technical support. Remember, we are scientists, not businessmen. "Shen Qi has his own plan, he trains scientists, not business elites.

Yang Dingtian returned to the laboratory to continue the experiment, and digested and absorbed the theoretical knowledge imparted by Shen Qi.

Shen Qi's derivation of the disorder-order phase transition rule and the basic mathematical and physical equations of the one-dimensional lattice model consumed a lot of internal forces, and he needed to relax and then devote himself to the next stage of his research work. ()

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