Ultrafast Surface Transport Measurement of the Topological Surface State in Sb<sub>2</sub>Te<sub>3</sub> by Using Time-Resolved Two-Photon Photoemission with Mid-Infrared Laser Pulses

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Other Title
  • 中赤外パルスレーザーを用いた時間分解二光子光電子分光による トポロジカル絶縁体Sb<sub>2</sub>Te<sub>3</sub>の光誘起表面電流測定
  • 中赤外パルスレーザーを用いた時間分解二光子光電子分光によるトポロジカル絶縁体Sb₂Te₃の光誘起表面電流測定
  • チュウ セキガイ パルスレーザー オ モチイタ ジカン ブンカイ ニ ミツコ コウデンシ ブンコウ ニ ヨル トポロジカル ゼツエンタイ Sb ₂ Te ₃ ノ ヒカリ ユウキ ヒョウメン デンリュウ ソクテイ

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<p>Ultrafast photoexcitation of the spin-polarized Dirac surface state in the topological insulator Sb2Te3 was investigated by using time- and angle-resolved two-photon photoemission spectroscopy combined with tunable mid-infrared pump pulses. It was revealed that mid-infrared pump permits a direct excitation between the occupied and unoccupied part of the surface Dirac-cone. Moreover, the direct optical coupling induces asymmetric transient populations in the surface states at ±k||, which reflects a macroscopic photoexcited electric surface current. By observing the decay of the asymmetric population and its temperature dependence, the ultrafast dynamics of the surface current was visualized in the momentum space.</p>

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 38 (8), 400-405, 2017

    The Surface Science Society of Japan

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