Studying White Graphene



A large international team is studying white graphene. The team involves scholars from NYU Tandon School of Engineering and KAIST (Korea Advanced Institute of Science and Technology). They have discovered a new method to characterize and identify defects in hexagonal boron nitride (hBN). This two dimensional material is called white graphene for its amazing properties.

The team replaced singular carbon atoms with boron atoms in hBN crystals. They listened to electronic "noise" in transistors and made this discovery.

The research is the cover story for October 22, 2024 edition of ACS Nano. 

Davood Shahrjerdi and Yong-Hoon Kim are the paper's corresponding authors. Shahrjerdi reports, "In this project, we essentially created a stethoscope for 2D materials. By analyzing the tiny and rhythmic fluctuations in electrical current, we can 'perceive' the behavior of single atomic defects." 

The NYU and KAIST collaboration launched in September 2022 by the President of South Korea. Currently, it involves 200 scientists from both universities. 

Scientists were able to monitor jumps in current that flowed through a transistor. These jumps are known as random telegraph signals (RTS). They happen when electrons are captured and released by defects in the white graphene. By analyzing at different temperatures and voltages, the group was able to determine energy levels and locations of defects.

Shahrjerdi explained, "Understanding and controlling the defects in 2D materials could have significant implications for the future of electronics and quantum technologies. For example, we might be able to create ore perfect quantum material,  platforms for discovery of new physics or single photon emitters for secure communications." 

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