Nonlinear Optical Responses in a Twisted Bilayer Graphene―A Dynamical-Symmetry Viewpoint

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  • ねじれ2層グラフェンの非線形光学応答の理論――動的対称性の観点から
  • ネジレ 2ソウ グラフェン ノ ヒセンケイ コウガク オウトウ ノ リロン : ドウテキ タイショウセイ ノ カンテン カラ

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Abstract

<p>Twisted bilayer graphene (TBG), two sheets of graphene vertically stacked with an artificial twist angle, has recently attracted tremendous attention as the twist has turned out to induce various phenomena like superconductivity. Here, we theoretically study its nonlinear optical properties, showing that the TBG exhibits enriched high-harmonic generation that cannot occur in monolayer or conventional bilayers. We systematically elucidate the selection rule of the activate harmonic orders from the dynamical-symmetry viewpoint combined with the Floquet theory. These results imply nonlinear “optotwistronics,” or controlling optical properties of layered materials by artificial twists.</p>

Journal

  • Butsuri

    Butsuri 77 (1), 29-34, 2022-01-05

    The Physical Society of Japan

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