Magnetoexcitons in cuprous oxide
Magnetoexcitons in cuprous oxide
复制标题
氧化亚铜中的磁激子
DOI：
10.1103/physrevb.95.035202
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发表时间：
2016
影响因子：
3.7
通讯作者：
M. Bayer
中科院分区：
文献类型：
--
作者：
Frank Schweiner;J. Main;G. Wunner;M. Freitag;J. Heckotter;C. Uihlein;M. Assmann;D. Frohlich;M. Bayer
用高分辨光谱研究氧化亚铜的激子谱时，最引人注目的两个实验发现是J.Thewes等人报道的$F激子的可观测性和精细结构分裂。[物理。莱特牧师。115,027402(2015年)]。这些发现表明，在激子理论中，考虑固体的复杂价带结构和立方对称性是必不可少的。这对磁激子来说尤为重要，因为外加磁场会进一步降低系统的对称性。给出了外加磁场作用下{Cu2}O}中激子的理论，特别讨论了外加磁场方向对光谱的依赖关系，这是简单的类氢模型所不能理解的.利用高分辨光谱，我们也给出了相应的法拉第组态氧化亚铜的实验光谱。理论结果和实验光谱无论是在能量方面还是在相对振子强度方面都很好地符合。此外，这种比较还允许确定该半导体的第四个Luttinger参数。
Two of the most striking experimental findings when investigating exciton spectra in cuprous oxide using high-resolution spectroscopy are the observability and the fine structure splitting of $F$ excitons reported by J. Thewes et al. [Phys. Rev. Lett. 115, 027402 (2015)]. These findings show that it is indispensable to account for the complex valence band structure and the cubic symmetry of the solid in the theory of excitons. This is all the more important for magnetoexcitons, where the external magnetic field reduces the symmetry of the system even further. We present the theory of excitons in $\mathrm{Cu_{2}O}$ in an external magnetic field and especially discuss the dependence of the spectra on the direction of the external magnetic field, which cannot be understood from a simple hydrogen-like model. Using high-resolution spectroscopy, we also present the corresponding experimental spectra for cuprous oxide in Faraday configuration. The theoretical results and experimental spectra are in excellent agreement as regards not only the energies but also the relative oscillator strengths. Furthermore, this comparison allows for the determination of the fourth Luttinger parameter $\kappa$ of this semiconductor.