MTL - The Science Fiction World of Xueba-Chapter 409 Cao Yuan's doubts

Cao Yuan is working in the low-dimensional physics and chemistry research department of the Microscale Material Science Research Center, and independently leads a team to study possible superconducting phenomena in two-dimensional graphene electronic systems.

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

Although it was a weekend, the laboratory apparently had no rest, and several researchers in white coats were busy inside.

Cao Yuan pushed in and clapped his hands and said, "Everyone stop the work at hand and see who is coming!"

Soon everyone looked up and looked at the door.

"Fuck, Pang Shen!"

"Professor Pang came to see us!"

"Professor Pang, I'm your fan!"

...

The laboratory suddenly boiled. Soon, everyone gathered around, and the eyes looking at Pang Xuelin were full of excitement and admiration.

This not only stems from Pang Xuelin's generous statement created in the academic world, but more importantly, during this period of cooperation with Pang Xuelin, they witnessed the miracle with their own eyes.

Four years ago, Cao Yuan and his mentor discovered that while studying at the Massachusetts Institute of Technology, he realized the superconductivity of graphene's two-dimensional electronic system through low temperature and changing electric field strength.

This is also the fame of Cao Yuan, which caused a huge sensation in the academic world, and therefore Cao Yuan was included in the top ten scientific figures in 2018 by Nature Magazine.

But so many years have passed, and the physics community has not found more physical mechanisms in graphene superconductivity. This discovery can only be temporarily dusted, waiting for people to make further breakthroughs on this basis.

However, not long ago, Pang Xuelin proposed a new idea when working with Cao Yuan. At a 2.5-degree angle of the two-dimensional graphene electronic system, the microwave irradiation in the two-dimensional graphene electronic system was changed by low temperature Intensity reproduces the superconducting phenomenon in graphene's two-dimensional electrons.

This is surprising.

Under the same experimental conditions, the superconducting phenomenon is realized by changing the electric field intensity and the microwave irradiation intensity, respectively.

Both Cao Yuan and his team members couldn't believe it. If it wasn't for Pang Xuelin's academic status here, they wouldn't think that this possibility exists at all.

However, the experimental results hit them hard. 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 entire 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.

At an included angle of 2.5 degrees, microwave irradiation was applied to show superconductivity.

Don't talk about them, if this news is announced now, it will inevitably make a splash in the global physics community.

Because theoretical physicists can completely build a new superconducting theory through this phenomenon, it may even have a revolutionary impact on the development of superconductors.

To their surprise, Pang Xuelin was somewhat unprepared for this result, and even when Cao Yuan proposed to publish the news, Cao Yuan's actions were stopped.

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

Because of this, all members of Cao Yuan's team, Pang Xuelin, have a feeling of solitude.

"Hello everyone!"

Pang Xuelin smiled and greeted Cao Yuan's team members. The people in Cao Yuan's team were very young, and the oldest ones looked like they were in their thirties. Most of the rest were only 27 or 8 years old.

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

Dong Chenglin is not tall, he is in his early sixties, and weighs more than one hundred and fifty. His eyes narrowed when he laughed, like a Maitreya.

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

"Hello Professor Dong!"

"Professor Pang, we finally look forward to you, welcome and welcome."

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

Zhou Tong is a beautiful little girl with freckles on her face wearing round glasses, and the only woman in Cao Yuan's team. .

Seeing Pang Xuelin, Zhou Tong's eyes glowed:

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

Zhou Tong looked a little excited when she saw the star idol.

"of course can."

Pang Xuelin said with a smile.

As for the remaining two, they are doctoral students from Cao Yuan, one named Wei Wenxuan and the other named Tan Song. They look somewhat restrained in front of Pang Xuelin.

Although they are members of Cao Yuan's team, Pang Xuelin is the real big boss in the search for a new type of superconductor. Coupled with the halo enveloped by Pang Xuelin, they all have the feeling of seeing legendary characters.

After introducing the team members, Cao Yuan said: "Okay, now that UU is reading www.uukanshu.com, Professor Pang is here, let's have a 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 predictions given by you, our team found that superconductivity also exists in graphene two-dimensional electronic systems through low temperature and changing the intensity of microwave irradiation. This is our section Based on the data accumulated over time, we found that in a lower magnetic field far from the quantum Hall state, the two-dimensional electronic system exhibits a novel reluctance oscillation. Its periodic structure can use microwave frequency ω and cyclotron resonance frequency ωc (Landau Energy level interval) is characterized by the ratio ε≡ω / ωc: 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. Compared with the magnetoresistance without microwave, the contribution of microwave to the magnetoresistance is positive at the oscillation peak and negative at the oscillation valley. Further experiments found that as the sample becomes more pure, the oscillation caused by microwave becomes more and more The dominant characteristic of the sample's magnetic resistance, and the resistance value of the oscillation valley is getting smaller and smaller, and it has a tendency to become zero. "

"In the end, we observed on a very pure sample that the resistance value of the magnetoresistive oscillation valley under microwave excitation decreases exponentially with temperature, which is the so-called two-dimensional electronic system superconductivity under microwave irradiation. phenomenon."

"Professor Pang, I would like to ask, how did you know that graphene will appear superconducting under a 2.5 degree angle and microwave irradiation?"

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

This is not only the question of Cao Yuan, but also the question of everyone else.