Chapter 345 Aren’t You Sick? Xu Zhengyang and his classmates had classes in the afternoon, so they didn't go to the library. They parted at the intersection in front of the Farm Restaurant. On both sides, the branches have sprouted tender buds, not many, but the dots of green combined together, the breath of spring is overwhelming. Xu Qingzhou looked at the backs of Xu Zhengyang and the other two disappearing at the intersection, and suddenly felt a little dazed. In the second year of university, everyone's youthfulness had faded a lot, even Xu Zhengyang started going to the library. Moreover, thinking back carefully, he found that his mentality was also getting younger. He teased the school beauty Song, got beaten, or chatted with Xu Zhengyang and others. The outline of the lifeless middle-aged man gradually disappeared in his memory. After returning to the library and sending a message to Song Yao, Xu Qingzhou immersed himself in calculations again. At 5:2 in the afternoon, the setting sun was already hanging in the sky, on the second floor of the Jingyuan. Han Shiyi, who was about to go to the cafeteria to eat, happened to meet Song Yao. "Junior sister, I haven't seen you for two days. What are you busy with?"
Han Shiyi looked at Song Yao and greeted her with a smile. Who says that only boys want to look at beautiful girls? As a girl, she also wants to be close to pretty girls. Song Yao said: "Xu Qingzhou is sick, I am taking care of him at home." "Oh, it's easy to get sick when the seasons change." Although she said this, Han Shiyi had already started to feel unhappy in her heart. As she got to know them better, she realized that Song Yao was just being cold to them. But this is exactly the point that makes people very upset. Because it is more in line with the character of the heroine in the novel, who reserves her tenderness for one person. Han Shiyi invited: "Junior sister, let's go to dinner together?" "I'm not eating today. I want to go home." Song Yao shook her head apologetically. "It's okay, I'm just asking." Han Shiyi suddenly remembered that this junior sister had a patient at home. When she and Song Yao came out of the School of Economics, she saw a boy wearing a mask standing at the intersection. Judging from the figure, it was that very awesome junior fellow apprentice. After simply saying hello to Xu Qingzhou, Han Shiyi hurried away. On this side, Song Yao first touched Xu Qingzhou's forehead to make sure that he would not have a fever again. In fact, after taking the medicine at noon, his body was almost recovered, but Xu Qingzhou still rubbed his temples and sighed: "I feel a little weak, I guess I need to rest for another two days." The setting sun hung in the sky, dyeing a large patch of clouds. Soft orange-yellow light spread over the earth. Under the green gardenia tree, two young men stood facing each other, their shadows cast by the afterglow intertwined. This is the scene that the drug expert Han Shiyi saw from a distance. Is this what it feels like to be hit by spring? Damn it, I’m taking it crazy! So Xu Qingzhou enjoyed two more days of preferential treatment. That day, Xu Qingzhou was lying on the sofa, and lazily called to the girl who was pouring cat food for Er Miao: "Xiao Song, pour a glass of water for Teacher Xu."
Song Yao stared at Xu Qingzhou with her crystal clear eyes. She had reason to suspect that this guy had recovered from his illness and was just simply acting. For example, in the afternoon, she was cooking in the kitchen, and she was worried about this guy so she took a sneak peek. She saw him happily teasing the second cat and looking very energetic. But when she came out, he looked listless again. However, she still stood up, poured a cup of hot water, took a sip herself, and when she found it was not hot, she handed it to Xu Qingzhou. "You're not well yet?" Xu Qingzhou touched his forehead and said, "No, it feels worse than the last two days. My whole body aches and I have no strength. Xiao Song, peel an orange for Teacher Xu." Song Yao went to the dining table to get an orange, peeled it, and threw it directly to him from two meters away, but it was slightly off target when she threw it. Xu Qingzhou was quick to catch it, muttering, "Xiao Song, I'm not saying anything bad about you, but remember to throw it accurately next time. If I wasn't so agile, this orange would be gone." As he was speaking, he found Song Yao staring at him expressionlessly. "Feeling exhausted?" "." "Look, it's all because of you taking good care of me. I suddenly feel like nothing is wrong." puff~ "Wrong, wrong~" "My waist!" Xu Qingzhou was pressed on the sofa and beaten. 10 minutes passed. "lighter." "Oh, good." Xu Qingzhou had a "flattering" expression, rubbing her waist with one hand and massaging Song Xiaohua's shoulders with the other hand, "Are you satisfied?" Song Yao nodded slightly, snorted, changed her posture, leaned on the sofa, tapped Xu Qingzhou's chest with her toes, and said slowly: "You can talk about your problem now." "I was wrong." Xu Qingzhou suppressed the urge to hold the white feet and maintained a serious attitude. "It's obvious." At 11:30, the two had finished their shower and were snuggling in bed, planning to go to bed early today. "If you move again, I'll beat you up." Song Yao slapped someone's dog paw away. She had no self-control now that she had just recovered from her illness. "I'm already fine." "You're not well." "." Xu Qingzhou sighed, shooting himself in the foot, shook his head, and hugged the girl in his arms. The bedroom was quiet for a moment, and then Song Yao's voice rang out again: "In May, I will go to Singapore with Professor Li to attend an academic forum."
"Well, I can stay alone in an empty room." Xu Qingzhou sighed that Professor Li Dayue was so good to Song Yao that he was able to participate in various economic forums during his undergraduate studies. At the same time, he was thinking that since he was alone in the empty house, he should ask for some compensation when he came back. At this moment, the cell phone rang. Song Yao: "Jiahui." "Yaoyao, are you busy?" Song Yao glanced at Xu Qingzhou: "No, I've already been busy." The beating is over, everything is fine now. "Yaoyao, Guo Ziyang is very busy now. He codes with his senior every day." After listening to what Ding Jiahui said, Xu Qingzhou roughly understood that Guo Ziyang was too busy during this period, and Ding Jiahui couldn't even call to make soup, so she was so bored that she could only find Song Yao to chat. Song Yao noticed that Ding Jiahui's tone was a little sad, and said, "He is ambitious, you should be happy.?" Ding Jiahui paused for a moment, leaned on the windowsill, and felt that her sister was right: "Yes, he just got busy all of a sudden and didn't have time to eat together. Maybe I should be busy too." The two chatted casually until 12 o'clock, when Ding Jiahui's roommate was about to go to bed, and the two girls hung up the phone. You have to pay for what you have done. Xu Qingzhou was enslaved for the next few days, cooking, washing dishes, sweeping and mopping the floor. After the little episode of illness, Xu Qingzhou devoted himself completely to physics calculations. In the library, there was a pile of manuscript paper in front of Xu Qingzhou. In classical quantum theory, the wave function describing the freely moving electron is described by ψ0=ei p·r/, with its normalization factor set to 1, where p=mv is the momentum of the electron. The Hamiltonian of a charged charge in a magnetic field is: H=1\2m(pqA) For electrons, there is an equation: H=12m(p+eA) When there is no magnetic field, the above equation is the equation of free electrons, that is, the wave function at this time can be written as: 【ψ(r，t)=0(r)eiEt/\psi】 Through calculations, Xu Qingzhou has been able to discover the connection between the AB effect and the topological properties of quantum states, the quantum Hall effect in condensed matter physics, and other phenomena. However, the details still need to be deduced in detail. At present, condensed matter physics occupies half of the physics world, so much so that Xu Qingzhou has been involved in a large number of experiments in this area. There is no way, condensed matter contains too many things. A more quantum mechanical way of saying it is that for a considerable class of condensed matter systems, the total Hilbert space is the direct product of the subspaces of each particle, and as the number of particles increases, the Hilbert space obviously increases exponentially. But from a macroscopic perspective, you can see that cutting off or adding a little bit of a piece of material does not seem to affect the material's properties, such as its strength. That is to say, not all parts of this huge Hilbert space are playing a role, and in fact only a very small subspace is important to real physics. Condensed matter physics, basically, is about finding this key Hilbert space, writing a multi-electron Hamiltonian that includes interactions based on a certain type of material or specific physics, and then solving it using various methods. (End of this chapter)