Bound states in continuum in graphene interfaces

ORAL

Abstract

We present experimental evidence of discrete bound states coexisting in the continuum (BIC) in certain graphene interface systems. The interaction of discrete states and the continuum is enabled by interface quantum confinement, and is a direct result of resonant interlayer multiple scattering. We used elastic electron back-scattering, in the very low energy range, to characterize these interlayer resonant states in graphene, using a low energy electron microscope (LEEM). We used Raman spectroscopy to further probe the inelastic light-matter interaction. We discovered a unique type of Fano-resonance around the D mode and G mode of the graphene lattice vibrations. The anomalous Fano-resonance is also a direct result of the quantum confinement and interplay between discrete phonon states and excitonic electronic continuum.

*This research used resources of the Center for Functional Nanomaterials and the National Synchrotron Light Source II, which are U.S. Department of Energy Office of Science facilities at Brookhaven National Laboratory, under Contract No. DE-SC0012704. ZG, QZ, and ATCJ acknowledge support from the National Science Foundation through MRSEC DMR-1720530 and EAGER 1838412. SP and JZ are supported by the NSF MRI program under Grant No. PHY-1229408.

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Presenters

  • Zhongwei Dai

    • Center for Functional Nanomaterials, Brookhaven National Laboratory

Authors

  • Zhongwei Dai

    • Center for Functional Nanomaterials, Brookhaven National Laboratory

  • Zhaoli Gao

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

  • Sergey Pershoguba

    • Department of Physics & Astronomy and Materials Science Program, University of New Hampshire
    • Yale University

  • Nikhil Tiwale

    • Center for Functional Nanomaterials, Brookhaven National Laboratory

  • Ashwanth Subramanian

    • Department of Materials Science and Chemical Engineering, Stony Brook University

  • Qicheng Zhang

    • Department of Physics and Astronomy, University of Pennsylvania

  • Calley Eads

    • Center for Functional Nanomaterials, Brookhaven National Laboratory

  • Samuel Tenney

    • Center for Functional Nanomaterials, Brookhaven National Laboratory

  • Chang-Yong Nam

    • Center for Functional Nanomaterials, Brookhaven National Laboratory

  • Jiadong Zang

    • Department of Physics & Astronomy and Materials Science Program, University of New Hampshire
    • University of New Hampshire

  • charlie T johnson

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

  • Jerzy T. Sadowski

    • Center for Functional Nanomaterials, Brookhaven National Laboratory
    • Brookhaven National Laboratory
    • Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973
    • CFN, Brookhaven National Laboratory