原子限界を超えた固体ハーモニック

Georges Ndabashimiye^1,2, Shambhu Ghimire², Mengxi Wu³

¹Department of Applied Physics, Stanford University, Stanford, California 94305, USA.

Nature

|June 10, 2016

まとめ

固体における高和音生成は,複数の高台を示し,類似の電子穴再衝突機構を示唆し,ガスとは異なる. これは,固体状態アット秒パルス生成と軌道トモグラフィーの可能性を開きます.

科学分野:

固体物理学
量子光学
非線形光学

背景:

強いフィールドのレーザー刺激は,固体における非線形電子と光学的振る舞いを誘導する.
固体における高調和生成 (HHG) は真空紫外線と極紫外線領域に広がる.
固体と原子ガスの間のHHGメカニズムにおける根本的な違いが議論されている.

研究の目的:

アルゴンとクリプトンの固体とガス相を直接比較する.
固体 HHG の高密度と周期性の役割を調査する.
固体 HHG の基礎にある顕微鏡のメカニズムを明確にします.

主な方法:

高貴ガス (アルゴン,クリプトン) の固体とガス相におけるHHGの実験的比較
ハーモニック生成スペクトルの測定
レーザーの円性によるハーモニック・イェンジメントの分析

主要な成果:

固体HHGスペクトルは,原子限界を超えて広がる複数の高原を示しています.
複数のプラトウは,複数の単粒子のバンドを含む強いインターバンドカップリングを示します.
固体とガスのHHG出力は,レーザー円性に類似しており,電子穴再衝突を示唆しています.

結論:

高貴ガス固体は,HHGにおける密度と周期性の効果を研究するためのユニークな媒介を提供します.
電子穴再衝突は固体 HHG で有意である.
ポラライゼーションゲーティングや軌道トモグラフィーのようなガス相技術は固体に適用できる.

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