Chapter 146 Is this really your first time?
Different from insulators in the conventional sense, topological insulators are special materials with internal insulation but an interface that allows charge movement.
Studying topological insulators is of great significance and can provide an in-depth understanding of various basic issues in quantum physics and condensed matter physics.
And this material also has great application prospects in the field of quantum computing.
Ning Chen believes that through this research, it will be of great help to his level of physics.
The next day, Ning Chen got up early and came to the laboratory after breakfast.
Arrived at the entrance of the laboratory, Ning Chen found that the laboratory had not opened yet, so he stood outside the door and waited.
You can't blame others. After all, Ning Chen arrived a little early. At this time, most laboratories were not open yet.
At eight o'clock in the morning, a man walked towards Ren Mingshan's laboratory.
“Classmate, are you Ning Chen?”
A sweet female voice came. Ning Chen turned around and found a girl who looked very young.
If she were not in university, Ning Chen would have thought that this was a high school student, but now that she has reached the stage of entering the laboratory, she should be at least a senior student.
“Yes, I am Ning Chen.”
“Well, that’s right, come in with me.”
Ning Chen thinks it should be Ren Mingshan When I mentioned what I had explained to her, I didn't rush to ask more questions.
The two of them entered the laboratory together. While the girl was preparing for the experiment, she said to Ning Chen:
“I heard that you came to Yanda for exchanges before, but I didn’t expect that you would come to our laboratory today. Let me introduce myself. My name is Qi Wan. Now Boyi, um...you should call me senior sister."
Hearing Qi Wan's words, Ning Chen asked in surprise:
" Have you already graduated?"
Ning Chen always felt that Qi Wan looked like an underage girl.
"Why, it doesn't look like it?"
"It doesn't look like it. If you say you are a high school student, I don't think many people will doubt it."
"Then how old do you think I am?"< br>
Ning Chen thought for a while, if it was Bo Yi, the normal age would probably be about 25 years old.
"Twenty-two or three years old?" Ning Chen asked.
"Actually, I'm only nineteen years old this year. I went to school relatively early, skipped a few grades in the middle, and was admitted to YCU through physical education at the age of fifteen. Now I'm in my first year of direct education. Hey, many people think of me as a high school student. "I'm so worried about life."
Seeing Qi Wan say this, Ning Chen couldn't help but marvel.
Ning Chen recalled that when he was fifteen years old, he was just a freshman in high school. Not to mention high school competitions, he had only just learned various speed-changing sports in high school physics.
Qi Wan can be recommended to Yan University at this age. This result must at least reach the level of the national training team, which is the level of the top 50 in the country.
Thinking about it this way, sometimes the gap between people is really bigger than the gap between people and dogs.
However, this can also show that Qi Wan not only looks young, but is also very young in real age.
"Then you can't say she is my senior sister. I am also a first-year student now, and in terms of age, I am one year older than you."
"What, you are also in the class A freshman? I remember you were only in your sophomore year?”
“Yes, but that was already last semester. You can skip the grade, and so can I.” said.
"So, you finished your undergraduate degree in two years? You are really perverted!"
Ning Chenxin said that he was able to graduate so quickly with the help of system plug-ins, and Qi Wan was the real pervert.
Qi Wan seemed to suddenly think of something again, and his frown suddenly relaxed. "No, you should still call me senior sister. This seniority is based on the time you enter the laboratory. Today is your first day in the laboratory. I have been in the laboratory for several months."
Actually, if it was really a doctoral student who was older than him, it would be okay for Ning Chen to call him senior sister. After all, he was coming to study in a new environment, so he had to be polite when meeting people.
But facing Qi Wan, a girl who was in the same grade as him and even younger than him, Ning Chen really couldn't call her "senior sister".
Ning Chen had an idea and said:
"It's not impossible to call me senior sister, but you are younger than me, so the most I can do is call you 'senior sister'."
Hearing Qi Wan curled her lips at Ning Chen's strange name and said:
"Forget it, forget it, this is too unpleasant, you'd better just call me by my name."
Qi Wanjian Unable to become Ning Chen's senior sister, she had to give up the idea and told Ning Chen about their experimental topic.
Through Qi Wan's narration, Ning Chen quickly understood the main research content of this topic.
This topic mainly studies the properties of surface states of topological insulators, including electronic standing waves, Landau quantization, etc.
The experimental operations in the entire topic are not complicated, but they involve a lot of data processing and theoretical analysis. This is the difficulty of this topic.
"Ning Chen, do you understand what I said?"
"Yes, I understand."
"Then let me take a look at my experimental operation first and study it carefully. I will only demonstrate it to you once."
Ning Chenxin said that as a "senior sister", she has the airs to be a senior sister. However, Ning Chen didn't say anything, and just watched Qi Wan's operations silently.
In this experimental subject, the main measuring instrument needed is the scanning tunneling microscope (STM).
When Ning Chen usually did experiments, the only microscope equipment he used was scanning electron microscopes and transmission electron microscopes. This was Ning Chen's first time coming into contact with this new equipment.
Different from other microscopes, scanning tunneling microscopes have higher spatial resolution and are often used to measure the properties of various surface states of particles.
After watching Qi Wan's operations, Ning Chen had memorized the details of Qi Wan's previous operations.
"How is it, have you learned it?"
"Yes, I have learned it."
"Really? It's up to you to do it. But I remind you. "The price of this instrument is 200,000 yuan. If it breaks... I can't afford to pay for it anyway."
Ning Chenxin said that he can still afford to pay for an instrument worth 200,000 yuan. of.
Of course, Ning Chen would definitely not act rashly without being prepared.
Although this is Ning Chen’s first contact with a scanning tunneling microscope, after all, there are similarities between various microscopes.
Coupled with the fact that Qi Wan had just explained the operating steps and precautions of this instrument in detail, Ning Chen was confident that he could operate it normally.
"It doesn't matter. If it breaks, it's mine."
Seeing Ning Chen say this, Qi Wan gave the instrument to Ning Chen.
Ning Chen first placed the measurement sample on the sample stage, pointed it at the probe of the microscope, then turned on the power of the microscope and adjusted the distance between the sample and the probe.
This distance is not so easy to control. It cannot be too far or too close. Otherwise, the ideal three-dimensional structure diagram will not be obtained.
At the beginning, Ning Chen was constantly making adjustments, looking for the most suitable distance.
However, after a period of adaptation, Ning Chen quickly found the feel and completed the first measurement.
Looking at the three-dimensional structure diagram of the material surface displayed on the screen, Qi Wan was also very surprised.
"No, Ning Chen, is this really your first time using STM?"
(End of Chapter)