Optical absorption of atomic-precise graphene nanoribbons on insulating substrate

ORAL

Abstract

We report the reflection contrast spectra of atomic-precise armchair graphene nanoribbons (GNRs) on insulating substrates. As-grown GNRs are transferred from gold to an insulating substrate by the “bubbling” method. Polarization control of light is employed to directly probe the one-dimensional (1D) optical resonances of armchair GNRs with different ribbon widths by the reflection contrast spectroscopy. We observed well-defined 1D optical resonances which are identified as optically-bright inter-band transitions in GNR samples. Our experimental interpretations are further supported by theoretical calculations within the GW framework, which reveals a strong excitonic effect with exceptionally large exciton binding energies.

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Presenters

  • Sihan Zhao

    • University of California, Berkeley

Authors

  • Sihan Zhao

    • University of California, Berkeley

  • Gabriela Borin Barin

    • Empa
    • Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
    • EMPA

  • Ting Cao

    • Physics, UC Berkeley
    • University of California, Berkeley
    • Physics Department, UC Berkeley and Geballe Laboratory for Advanced Materials, Stanford University
    • Physics Department at UC Berkeley and Geballe Laboratory for Advanced Materials at Stanford University
    • Geballe Laboratory for Advanced Materials, Stanford University

  • TAIRU LYU

    • University of California, Berkeley

  • Steven G. Louie

    • Physics, UC Berkeley
    • University of California, Berkeley
    • Department of Physics, University of California, Berkeley
    • Physics Department, UC Berkeley and Lawrence Berkeley National Lab
    • Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory
    • Physics, University of California at Berkeley
    • University of California at Berkeley and Lawrence Berkeley National Lab
    • University of California at Berkeley and Lawrence Berkeley National Laboratory
    • Physics, University of California, Berkeley
    • UC Berkeley and Lawrence Berkeley National Lab
    • Physics, University of California - Berkeley
    • Physics and Materials Sciences, University of California at Berkeley and Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab and University of California, Berkeley
    • University of California - Berkeley, Lawrence Berkeley National Laboratory

  • Roman Fasel

    • Empa
    • Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland
    • EMPA

  • 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