The Science Fiction World of Xueba

Cao Yuan works in the Low-Dimensional Physics and Chemistry Research Department of the Microscale Material Science Research Center, and independently leads a team to study the possible superconductivity phenomenon in two-dimensional graphene electronic systems.

Pang Xuelin followed Cao Yuan up to the third floor and came to a laboratory.

Although it was the weekend, the laboratory obviously did not rest, and several researchers in white coats were busy inside.

Cao Yuan pushed the door open, clapped his hands and said, "Everyone, stop what you're doing and see who's coming!"

Soon, everyone raised their heads and looked towards the door.

"Damn it, God Pang!"

"Professor Pang came to see us!"

"Professor Pang, I'm your fan!"

...

The laboratory suddenly boiled, and soon, everyone gathered around, looking at Pang Xuelin with excitement and reverence in their eyes.

This is not only due to Pang Xuelin's impressive statement in the academic world, but more importantly, during this period of cooperation with Pang Xuelin, they have witnessed miracles with their own eyes.

Four years ago, when Cao Yuan was a Ph.D. student at MIT, he and his supervisor discovered that the superconductivity of the graphene two-dimensional electronic system was realized through low temperature and changing the electric field strength.

This is also Cao Yuan's famous work, which caused a huge sensation in the academic world, and Cao Yuan was listed as one of the top ten scientific figures in 2018 by Nature Magazine.

But after so many years, the physics community has not discovered more physical mechanisms in graphene superconductivity, and this discovery can only be temporarily dusty, waiting for further breakthroughs on this basis.

However, not long ago, when Pang Xuelin cooperated with Cao Yuan, he proposed a brand-new idea. Under the angle of 2.5 degrees in the two-dimensional graphene electronic system, through low temperature and changing the microwave irradiation in the graphene two-dimensional electronic system Strength, reproducing the superconducting phenomenon in graphene two-dimensional electrons.

This is surprising.

Under the same experimental conditions, by changing the intensity of the electric field and the intensity of microwave irradiation, the phenomenon of superconductivity can be realized.

Cao Yuan and his team members couldn't believe it. If it wasn't for Pang Xuelin's academic status, they wouldn't think it was possible at all.

But the experimental results hit them hard. When they observed superconductivity in the graphene two-dimensional electronic system at an angle of 2.5 degrees under ultra-low temperature and microwave irradiation conditions, the whole laboratory was boiling. .

Everyone knows what this phenomenon means.

The graphene two-dimensional electronic system exhibits superconductivity when an electric field is applied at an angle of 1.7 degrees.

When the included angle is 2.5 degrees, microwave irradiation is applied, and superconducting phenomenon appears.

Let alone them, if this news is announced now, it will definitely cause a sensation in the global physics community.

Because theoretical physicists can use this phenomenon to construct a new superconducting theory, which may even have a revolutionary impact on the development of superconductors.

To their surprise, Pang Xuelin was not surprised by this result, and even stopped Cao Yuan when he proposed to release the news.

In Pang Xuelin's words, this is just the first step in a long journey to find room-temperature superconductors. There are still more difficult tasks to be completed in the follow-up.

Because of this, all members of Cao Yuan's team, Pang Xuelin, feel like they are looking up to the mountains.

"Hello everyone!"

Pang Xuelin smiled and greeted Cao Yuan's team members. The people in Cao Yuan's team were all young, the oldest one was only in his thirties, and most of the rest were only in their twenties or eighteen.

"Professor Pang, let me introduce you, this is Professor Dong Chenglin, the deputy leader of our experimental group.

"

Dong Chenglin is not tall, just over 1.6 meters, and weighs more than 150 by visual inspection. When he smiles, his eyes narrow, like a Maitreya Buddha.

Pang Xuelin knew that Dong Chenglin was the oldest member of Cao Yuan's team. He was 31 years old this year and was one of the core members of Cao Yuan's team.

"Professor Dong, hello!"

"Professor Pang, we finally expect you to come, welcome."

"Professor Pang, this is Associate Professor Zhou Tong, who is in charge of data processing within the team."

Zhou Tong is a little beauty with round glasses and freckles on her face. She is the only woman in Cao Yuan's team. .

Seeing Pang Xuelin, Zhou Tong's eyes lit up:

"Professor Pang, hello, can you sign for me later? I'm your fan..."

Zhou Tong acted like a little girl seeing a celebrity idol, she seemed a little excited.

"sure."

Pang Xuelin said with a smile.

As for the remaining two, they were doctoral students led by Cao Yuan. One was Wei Wenxuan and the other was Tan Song. They looked a bit reserved in front of Pang Xuelin.

Although they are members of Cao Yuan's team, Pang Xuelin is the real big boss in the project of searching for new superconductors. Coupled with the halo surrounding Pang Xuelin, they all have the feeling of seeing a legendary figure.

After introducing the team members, Cao Yuan said, "Okay, since Professor Pang is here, let's start the meeting directly."

Soon, everyone followed Cao Yuan to the conference room.

Cao Yuan opened the notebook and projected the content on the monitor to the screen.

Cao Yuan said: "Professor Pang, in the past two months, according to the theoretical prediction you gave, our team discovered that superconductivity also exists in the graphene two-dimensional electronic system through low temperature and changing the intensity of microwave irradiation. This is our paragraph Based on the data accumulated over time, we found that at a lower magnetic field far away from the quantum Hall state, the two-dimensional electronic system exhibits a novel magnetoresistance oscillation whose periodic structure can be used at the microwave frequency ω and the cyclotron resonance frequency ωc (Landau Energy level interval) ratio ε≡ω/ωc to characterize: when ε is about an integer (ε≈n), it corresponds to an oscillation peak, and when ε is about a half-integer (ε≈n +1/2 ), it corresponds to an oscillation valley. And Compared with the reluctance without microwave, the contribution of microwave to reluctance is positive at the oscillation peak and negative at the oscillation valley. Further experiments found that as the sample becomes more and more pure, the oscillation caused by microwave becomes more and more The dominant feature of sample magnetoresistance, and the resistance value of the oscillation valley is getting smaller and smaller, tending to become zero."

"Finally, we observed on a very pure sample that under microwave excitation, the resistance value of the magnetoresistance oscillation valley tends to zero exponentially as the temperature decreases. This is the so-called superconductivity of the two-dimensional electronic system under microwave irradiation." Phenomenon."

"Professor Pang, I would like to ask, how did you know that graphene will appear superconducting under microwave irradiation at an angle of 2.5 degrees?"

After Cao Yuan's voice fell, everyone's eyes in the meeting room were focused on Pang Xuelin.

This is not only Cao Yuan's question, but also everyone else's question.