Physicists create artificial 'graphene'

"We've basically created the first artificial graphene-like structure with transition metal atoms in place of carbon atoms," said Jak Chakhalian, professor of physics and director of the Artificial Quantum Materials Laboratory at the U of A.

In 2014, Chakhalian was selected as a quantum materials investigator for the Gordon and Betty Moore Foundation. His selection came with a $1.8 million grant, a portion of which funded the study,

Graphene, discovered in 2004, is a one-atom-thick sheet of graphite. Graphene transistors are predicted to be substantially faster and more heat tolerant than today's silicon transistors and may result in more efficient computers and the next-generation of flexible electronics. Its discoverers were awarded the Nobel Prize in physics in 2010.

The U of A-led group published its findings this week in Physical Review Letters, the journal of the American Physical Society, in a paper titled "Mott Electrons in an Artificial Graphene-like Crystal of Rare Earth Nickelate."

"This discovery gives us the ability to create graphene-like structures for many other elements," said Srimanta Middey, a postdoctoral research associate at the U of A who led the study.

The research group also included U of A postdoctoral research associates Michael Kareev and Yanwei Cao, doctoral student Xiaoran Liu and recent doctoral graduate Derek Meyers, now at Brookhaven National Laboratory.

Additional members of the group were David Doennig of the University of Munich, Rossitza Pentcheva of the University of Duisburg-Essen in Germany, Zhenzhong Yang, Jinan Shi and Lin Gu of the Chinese Academy of Sciences; and John W. Freeland and Phillip Ryan of the Advanced Photon Source at Argonne National Laboratory near Chicago.

The research was also partially funded by the Chinese Academy of Sciences.