Large-Area Epitaxial Growth of Curvature-Stabilized ABC Trilayer Graphene with Tunable Band Gap

ORAL

Abstract

The physical properties of epitaxially-grown layered van der Waals (vdW) materials can be engineered to an extraordinary degree by manipulating the number of atomic layers, their compositions, and their relative stacking configurations and twist angles. vdW trilayer graphene (TLG) can stack in either a semi-metallic ABA configuration or a semi-conducting ABC configuration with a gate-tunable band gap but to this point has only been produced via exfoliation, which greatly limits its scientific and technological development. Here we present a scalable approach to epitaxial TLG growth via chemical vapor deposition that reliably enhances the fraction and size of ABC stacked TLG domains compared to other methods. The key insight is that nanoscale substrate curvature can locally stabilize ABC domains, typically leading to alternating regions of ABC and ABA on topographically corrugated growth substrates. Unambiguous electronic signatures of ABC-TLG were revealed by nano angle-resolved photoemission spectroscopy and infrared scanning near-field microscopy. The ABC fraction remains high after transfer onto a device substrate, as confirmed by transport measurements showing a sizable and tunable ABC-TLG band gap.

–

Presenters

  • Zhaoli Gao

    University of Pennsylvania

Authors

  • Zhaoli Gao

    University of Pennsylvania

  • Sheng Wang

    University of California at Berkeley, University of California, Berkeley

  • Joel M Berry

    University of Pennsylvania

  • Qicheng Zhang

    University of Pennsylvania

  • Julian Gebhardt

    University of Pennsylvania

  • William Parkin

    University of Pennsylvania, Physics and Astronomy, Univ. of Pennsylvania

  • Jose Avila

    Synchrotron SOLEIL, Synchrotron-SOLEIL

  • Hemian Yi

    Synchrotron-SOLEIL, Synchrotron SOLEIL, Antares beamline, Synchrotron Soleil, Paris, France

  • Chaoyu Chen

    Synchrotron SOLEIL, Synchrotron-SOLEIL

  • Sebastian Hurtado Parra

    University of Pennsylvania

  • Marija Drndić

    University of Pennsylvania

  • Andrew Rappe

    University of Pennsylvania, Department of Chemistry, University of Pennsylvania, Chemistry, University of Pennsylvania

  • David Srolovitz

    University of Pennsylvania

  • J. M. Kikkawa

    University of Pennsylvania

  • Zhengtang Luo

    Hong Kong University of Science and Technology, Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology

  • Maria C. Asensio

    Synchrotron SOLEIL, Synchrotron-SOLEIL, Antares beamline, Synchrotron Soleil, Paris, France

  • Feng Wang

    University of California - Berkeley, University of California, Berkeley, Physics, UC Berkeley, Department of Physics, University of California at Berkeley, Berkeley, CA 94709, USA, University of California at Berkeley, Lawrence Berkeley National Laboratory and UC Berkeley, UC Berkeley, Physics, University of California, Berkeley

  • Alan T Johnson

    University of Pennsylvania, Physics and Astronomy, Univ. of Pennsylvania, Univ of Pennsylvania