Tracking topological conditions in graphene

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The scanning tunnel microscope’s measurements had been made in the Solid Surfaces Analysis lab at Chemnitz University of Technology by researchers together with doctoral scholar Thi Thuy Nhung Nguyen. Credit: Press Office and Crossmedia Communications Archive/Jacob Müller

Scientists have been in a position to exhibit that graphene nanostructures might be generated by annealing of a nanostructured silicon carbide crystal for a number of years. “These two-dimensional, spatially strongly restricted carbon bands exhibit a vanishingly small electrical resistance even at room temperature. They are thus ballistic,” explains Prof. Dr. Christoph Tegenkamp, Head of the Professorship of Solid Surfaces Analysis at Chemnitz University of Technology. Something comparable doesn’t occur, for instance, with an expanded and completely two-dimensional layer of graphene.

Physicists at Chemnitz University of Technology, working along with researchers from Eindhoven University of Technology (Netherlands), the Max Planck Institute in Stuttgart, and the MAX IV Laboratory in Lund (Sweden), succeeded in a greater understanding of this quantum impact. “We could verify the exact structure of these so-called nanoribbons for the first time with help of an extremely high-resolution transmission electron microscope,” reviews doctoral scholar Markus Gruschwitz from the Professorship of Solid Surfaces Analysis. Thi Thuy Nhung Nguyen, who can also be finishing her doctoral research in this space, provides, “Together with measurements from the scanning tunneling microscope, the particular quantum state of this system could now be localized and spectroscopized with high resolution.”

It is necessary for a theoretical description of the digital construction that the sting of the graphene nanostructure has a bond to the substrate and the bending induced by this causes a so-called pressure impact. Using this mannequin, it was additionally potential to elucidate the spin polarization of the migrating electrons. “This bending of the graphene structure has an effect similar to that otherwise found only in materials with strong spin-orbit coupling. Interestingly, graphene itself has a vanishingly small spin-orbit interaction,” Tegenkamp says.

The analysis outcomes had been introduced in the present challenge of Nano Letters. The authors of the research are sure that the exploitation of outlined curvatures will give rise to new functionalities in supposedly trivial constructions and supplies, and that the analysis area of straintronics will develop into additional established.


Spin-galvanic impact in graphene with topological topping demonstrated


More data:
Thi Thuy Nhung Nguyen et al. Topological Surface State in Epitaxial Zigzag Graphene Nanoribbons, Nano Letters (2021). DOI: 10.1021/acs.nanolett.0c05013

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Chemnitz University of Technology

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Tracking topological conditions in graphene (2021, April 19)
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