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Tunable spontaneous emission from layered graphene/dielectric tunnel junctions

Khorasani, S. A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/JQE.2014.2308976
  3. Abstract:
  4. There has been a rapidly growing interest in optoelectronic properties of graphene and associated structures. Despite the general belief on absence of spontaneous emission in graphene, which is normally attributed to its unique ultrafast carrier momentum relaxation mechanisms, there exist a few recent evidences of strong optical gain and spontaneous light emission from monolayer graphene, supported by observations of dominant role of out-of-plane excitons in polycyclic aromatic hydrocarbons. In this paper, we develop a novel concept of light emission and optical gain from simple vertical graphene/dielectric tunnel junctions. It is theoretically shown that the possible optical gain or emission spectrum will be easily tunable by the applied voltage. We present details of quantum mechanical calculations and perform an exact analysis of field-assisted tunneling using transfer matrices combined with expansion on Airy's functions
  5. Keywords:
  6. Graphene ; Light emission ; Tunneling ; Electron tunneling ; Emission spectroscopy ; Light emission ; Optical gain ; Polycyclic aromatic hydrocarbons ; Spontaneous emission ; Transfer matrix method ; Applied voltages ; Emission spectrums ; Exact analysis ; Momentum relaxation ; Optoelectronic properties ; Quantum-mechanical calculation ; Transfer matrixes ; Ultrafast carriers ; Graphene
  7. Source: IEEE Journal of Quantum Electronics ; Vol. 50, issue. 5 , 2014 , p. 307-313
  8. URL: http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=6750038&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel7%2F3%2F6775320%2F06750038.pdf%3Farnumber%3D6750038