Shift Current: Quantum Mechanical Picture of the Bulk Photovoltaic Effect

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  • Ogawa Naoki
    理化学研究所創発物性科学研究センター 科学技術振興機構さきがけ
  • Sotome Masato
    理化学研究所創発物性科学研究センター
  • Nakamura Masao
    理化学研究所創発物性科学研究センター 科学技術振興機構さきがけ
  • Morimoto Takahiro
    東京大学大学院工学系研究科物理工学専攻 科学技術振興機構さきがけ

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Other Title
  • 光起電力の新しい量子力学的描像「シフト電流」
  • ヒカリキデンリョク ノ アタラシイ リョウシ リキガクテキビョウゾウ 「 シフト デンリュウ 」

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Description

<p>When a photon induces an interband transition in a solid, the excited electron (hole) experiences a spatial shift if the crystal lacks an inversion symmetry, leading to a generation of directional photocurrent. This phenomenon has been known as bulk or anomalous photovoltaic effect for years, and is recently reformulated with the viewpoint of quantum mechanics as the change in the geometrical phase upon photoexcitation. It is also predicted that this so-called shift current of electron (hole) can be less-dissipative and ultrafast. We demonstrate the emergence of shift current in several organic and inorganic ferroelectrics by using extensive optical spectroscopies, whose excitation spectra nicely compared to the ones from first-principles band calculations.</p>

Journal

  • Butsuri

    Butsuri 75 (3), 154-159, 2020-03-05

    The Physical Society of Japan

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