Graphene Lightwave Electronics

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Other Title
  • グラフェン光周波数エレクトロニクス
  • 最近の研究から グラフェン光周波数エレクトロニクス
  • サイキン ノ ケンキュウ カラ グラフェン ヒカリ シュウハスウ エレクトロニクス

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Abstract

<p>When solids are exposed to intense optical fields, the intraband electron motion may influence interband transitions, potentially causing a transition of light-matter interaction from a quantum (photon-driven) regime to a semi-classical (field-driven) regime. We demonstrate this transition in monolayer graphene. We observe a carrier-envelope-phase-dependent current in graphene irradiated with phase-stable two-cycle laser pulses, showing a striking reversal of the current direction as a function of the driving field amplitude at ～2 V/nm. This reversal indicates the transition into the field-driven (or strong-field) regime. We show furthermore that in this regime electron dynamics are governed by sub-optical-cycle Landau-Zener-Stückelberg interference, comprised of coherent repeated Landau-Zener transitions. We expect these results to have direct ramifications for light-field-driven electronics in graphene.</p>

Journal

  • Butsuri

    Butsuri 73 (10), 720-725, 2018-10-05

    The Physical Society of Japan

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