Abstract

We analyze a new type of the plasmon mode in nanosize semiconductor crystals. Rotational dipole plasmon resonance, in which only angular degrees of freedom are excited, prevails in the optical spectra of photodoped nanocrystals. Such a collective mode differs basically from surface plasmon resonances in typical photoabsorption spectra of metallic nanoclusters and can be described as an excited state in a finite Fermi system as well as a rotational motion of a quantum liquid. We demonstrate that such dipole oscillations are harmonic, which makes it possible to identify them as a plasmon resonant excitation.

中文翻译：

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半导体纳米粒子中的旋转偶极等离子体模式

摘要

我们分析了纳米尺寸半导体晶体中的一种新型等离子体模式。旋转偶极等离子体共振，其中仅激发角自由度，在光掺杂纳米晶体的光谱中占优势。这种集体模式与金属纳米团簇的典型光吸收光谱中的表面等离子体共振基本不同，可以描述为有限费米系统中的激发态以及量子液体的旋转运动。我们证明这种偶极子振荡是谐波的，这使得将它们识别为等离子体共振激发成为可能。