Cao Yuan is working in the Department of Low-Dimensional Physics and Chemistry of the Research Center for Microscale Physical Sciences, where he independently leads a team to study superconductivity that may occur in two-dimensional graphene electronic systems.

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

Although it was a weekend, the lab was clearly not closed, and several researchers in white coats were busy inside.

Cao Yuan pushed the door in, clapped his hands and said, "Let's stop what we're doing and see who's coming!" ”

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

", Pang Shen!"

"Professor Pang has come to see us!"

"Professor Pang, I'm your fan!"

……

The laboratory suddenly boiled, and soon, everyone gathered around, and their eyes were full of excitement and reverence when they looked at Pang Xuelin one by one.

This is not only due to the remarkable statement that Pang Xuelin has created in the academic world, but more importantly, they have witnessed a miracle with their own eyes during this time of working with Pang Xuelin.

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

This is also Cao Yuan's famous work, which caused a huge sensation in the academic community, and Cao Yuan was also listed in the top ten scientific figures of 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 dusted, waiting for future generations to make further breakthroughs on this basis.

However, not long ago, when Pang Xuelin cooperated with Cao Yuan, he proposed a new idea to reproduce the superconductivity phenomenon in graphene two-dimensional electrons by low temperature and changing the microwave irradiation intensity in the two-dimensional graphene electronic system at an angle of 2.5 degrees in the two-dimensional graphene electronic system.

This is surprising.

Under the same experimental conditions, the superconductivity phenomenon was achieved by changing the electric field intensity and microwave irradiation intensity, respectively.

Cao Yuan and his team members were a little incredulous, if it weren't for Pang Xuelin's academic status here, they didn't think that such a possibility existed at all.

But the results of the experiment slapped them in the face, when they observed the superconductivity of the graphene two-dimensional electronic system at an angle of 2.5 degrees under ultra-low temperature and microwave irradiation conditions, the whole laboratory boiled.

Everyone knows what this means.

When the graphene two-dimensional electronic system is at an angle of 1.7 degrees, an electric field is applied, and the phenomenon of superconductivity is exhibited.

At an angle of 2.5 degrees, microwave irradiation is applied, and the phenomenon of superconductivity is presented.

Not to mention them, if this news is released now, it will inevitably cause a sensation in the global physics community.

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

To their surprise, Pang Xuelin was a little unfazed by this result, and even stopped Cao Yuan's move when Cao Yuan proposed to release the news.

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

Because of this, all the members of Cao Yuan's team, Pang Xuelin, have a feeling of being in the mountains.

"Hello everyone!"

Pang Xuelin greeted Cao Yuan's team members with a smile, the people in Cao Yuan's team were very young, the oldest was in their thirties, and most of the rest were only twenty-seven or eighteen years old.

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

Dong Chenglin is not tall, only in his early sixties of one meter, weighs more than one hundred and fifteen, and his eyes are squinted when he laughs, as if he is a Maitreya Buddha.

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

"Hello, Professor Dong!"

"Professor Pang, we've finally looked forward to you, welcome."

"Professor Pang, this is Associate Professor Zhou Tong, who is responsible for data processing within the team."

Zhou Tong is a little beauty with freckles on her face wearing round-framed glasses, and 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 a fan of yours......"

Zhou Tong looked like a little girl seeing a star idol, and she looked a little excited.

"Absolutely."

Pang Xuelin said with a smile.

As for the remaining two, they are Cao Yuan's doctoral students, one is named Wei Wenxuan and the other is Tan Song, who looked a little restrained in front of Pang Xuelin.

Although they are members of Cao Yuan's team, in the project of finding a new type of superconductor, Pang Xuelin is the real big boss, coupled with the aura shrouded in Pang Xuelin, they all have the feeling of seeing legendary characters.

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

Soon, everyone followed Cao Yuan to the conference room.

Cao Yuan opened his notebook and projected the contents of the monitor onto the screen.

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

"Eventually, we observed on a very pure sample that the resistance value of the magnetoresistive oscillation valley under microwave excitation tends to zero exponentially with a decrease in temperature, which is the phenomenon of superconductivity of a two-dimensional electronic system under microwave irradiation."

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

Cao Yuan's words fell, and in the conference room, everyone's eyes were focused on Pang Xuelin.

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