Optical absorption in twisted bilayer graphene

DOI DOI Web Site Web Site 被引用文献49件 参考文献64件

書誌事項

公開日
2013-05-02
資源種別
journal article
権利情報
  • http://link.aps.org/licenses/aps-default-license
DOI
  • 10.1103/physrevb.87.205404
  • 10.48550/arxiv.1302.5218
公開者
American Physical Society (APS)

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説明

We theoretically study the optical absorption property of twisted bilayer graphenes with various stacking geometries, and demonstrate that the spectroscopic characteristics serve as a fingerprint to identify the rotation angle between two layers. We find that the absorption spectrum almost continuously evolves in changing the rotation angle, regardless of the lattice commensurability. The spectrum is characterized by series of peaks associated with the van Hove singularity, and the peak energies systematically shift with the rotation angle. We calculate the optical absorption in two different frameworks; the tight-binding model and the effective continuum model based on the Dirac equation. For small rotation angles less than $10^\circ$, the effective model well reproduces the low-energy band structure and the optical conductivity of the tight-binding model, and also explains the optical selection rule analytically in terms of the symmetry of the effective Hamiltonian.

12 pages, 9 figures

収録刊行物

  • Physical Review B

    Physical Review B 87 (20), 205404-, 2013-05-02

    American Physical Society (APS)

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