Nadj-Perge Group Generates Image of Magic Angle in Graphene Sheets

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The Nadj-Perge group and collaborators have generated an image of the magic angle that exists when two sheets of graphene are slightly twisted.

Nadj-Perge image of graphene's magic angle

August 15, 2019

Recently researchers at MIT made a fantastic discovery when they stacked sheets of graphene slightly offset from one another, around 1.1 degrees. At this angle, graphene electrons yield unique and potentially game-changing properties.

Assistant professor of Applied Physics and Materials Science Stevan Nadj-Perge and his group have taken this discovery a step further by generating an image of the atomic structure and electronic properties of magic angle-twisted graphene.

"When two layers of graphene are rotated relative to each other, electrons become localized at specific places in the crystal and give rise to a periodic height profile. The periodicity of this so-called Moiré pattern is set by the rotation angle and at the magic angle (around 1.1˚). For this rotation angle, the correlation effects between electrons are maximized."

Their work was published in Nature Physics on August 5 in the article titled, "Electronic correlations in twisted bilayer graphene near the magic angle." Co-authors of the paper include Gil Refael, Taylor W. Lawrence Professor of Theoretical Physics; Jason Alicea, professor of theoretical physics; Caltech graduate students Youngjoon Choi, Harpreet Arora, Robert Polski, and Yiran Zhang; Caltech postdoctoral scholars Jeannette Kemmer, Yang Peng, Alex Thomson, Hechen Ren; as well as Felix von Oppen of Freie Universität Berlin in Germany; and Kenji Watanabe and Takashi Taniguchi of the National Institute for Materials Science in Japan.

Read more about the group's work in the Caltech article, "Finding the Magic in the Magic Angle".