Resonant stimulated Brillouin scattering of orthoexcitons in Cu2O

被引：1

作者：

Sandfort, Christian ^{[1
]}

Brandt, Jan ^{[1
]}

Froehlich, Dietmar ^{[1
]}

von Hoegersthal, Giorgio Baldassarri Hoeger ^{[1
]}

Bayer, Manfred ^{[1
]}

Stolz, Heinrich ^{[2
]}

机构：

[1] Tech Univ Dortmund, Fak Phys, D-44221 Dortmund, Germany

[2] Univ Rostock, Inst Phys, D-18501 Rostock, Germany

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 24期

关键词：

acoustic wave scattering; copper compounds; excitons; fine structure; phonons; semiconductor materials; stimulated Brillouin scattering; RAMAN; POLARITONS; EXCITON;

D O I：

10.1103/PhysRevB.80.245201

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Resonant excitation of 1S orthoexcitons in Cu2O in a magnetic field leads to a fine structure in the Gamma(-)(3) and Gamma(-)(5) optical phonon assisted emission. This fine structure can be attributed to intraband and interband resonant Brillouin scattering. For increasing power a strong nonlinear enhancement of the intensity of this fine structure and a splitting due to preferential scattering into forward/backward direction is observed, indicating a stimulation of the scattering processes. We present a detailed analysis of the kinematics of the transversal/longitudinal acoustic (TA/LA) phonon scattering processes. The exclusive observation of slow TA interband scattering and LA intraband scattering is deduced from selection rules for acoustic phonon scattering and the deformation potentials. Furthermore, a strong asymmetric resonance dependence is observed.

引用

页数：5

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