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