Polariton effects in the dielectric function of ZnO excitons obtained by ellipsometry

被引：23

作者：

Cobet, Munise ^{[1
]}

Cobet, Christoph ^{[2
]}

Wagner, Markus R. ^{[1
]}

Esser, Norbert ^{[2
]}

Thomsen, Christian ^{[1
]}

Hoffmann, Axel ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Solid State Phys, D-10623 Berlin, Germany

[2] ISAS Inst Analyt Sci, D-12489 Berlin, Germany

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 03期

关键词：

dielectric function; electromagnetic fields; ellipsometry; excitons; II-VI semiconductors; polaritons; valence bands; wide band gap semiconductors; zinc compounds; SPECTROSCOPIC ELLIPSOMETRY; SPATIAL-DISPERSION; CRYSTALS; REFLECTANCE;

D O I：

10.1063/1.3284656

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The complex dielectric tensor of ZnO in the regime of the excitonic transitions is determined with ellipsometry and analyzed concerning the quantization of the electromagnetic field in terms of coupled polariton-eigenmodes. Negative sections in the real part indicate the significant formation of polaritons for the dipole-allowed excitons of the three upper valence-bands Gamma(7),Gamma(9),Gamma(7). The transverse-longitudinal splittings which separate the upper polariton branch from the lower branch, corresponding to the k-vector of the used light, are deduced precisely for each subband. Mainly for E parallel to c, additional absorption peaks are observed at the longitudinal B-exciton and closely above. One is considered to be a mixed-mode and the other is seen as a consequence of interference effects in an exciton free surface layer which is also visible in reflectance anisotropy spectroscopy.

引用

页数：3

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