Optical response and excitons in gapped graphene

Thomas Garm Pedersen, Antti-Pekka Jauho, K. Pedersen

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    Abstract

    Graphene can be rendered semiconducting via energy gaps introduced in a variety of ways, e.g., coupling to substrates, electrical biasing, or nanostructuring. To describe and compare different realizations of gapped graphene we propose a simple two-band model in which a "mass" term is responsible for the gap. The optical conductivity predicted for this model is obtained as a simple closed-form expression. In addition, analytical estimates for the binding energy of excitons are derived and the impact of excitons on the optical response is analyzed.
    Original languageEnglish
    JournalPhysical Review B. Condensed Matter and Materials Physics
    Volume79
    Issue number11
    Pages (from-to)113406
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    Copyright 2009 American Physical Society

    Keywords

    • energy gap
    • binding energy
    • nanostructured materials
    • elemental semiconductors
    • carbon
    • excitons
    • optical conductivity

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