论文标题
磁场中的第二次谐波产生氧化物的氧化物
Second Harmonic Generation of cuprous oxide in magnetic fields
论文作者
论文摘要
最近已经证明了氧化乡土的黄色激子系列的第二次谐波生成（SHG）已证明[J。 Mund等人，物理。 Rev. B 98，085203（2018）]。假设完美的$ o _ {\ mathrm {h}} $对称性，则沿某些高对称轴禁止SHG。扰动可以打破这种对称性，并且可能会允许禁止过渡。从理论上讲，我们研究了外部磁场对氧化乡土的黄色激子线的影响。我们确定了两种机制，通过这些机制，施加的磁场可以在禁止的方向上诱导第二个谐波信号。首先，磁场本身通常会提升选择规则。在VOIGT配置中，出现了一个额外的磁场电场。这也引起了与仅磁场引起的某些SHG过程不同。 A. Farenbruch等人对手稿的补充。 [物理。 Rev. b，提交的]，我们对包括复杂的价带结构（包括复杂的价谱带结构）进行了激子哈密顿量的完整数值对角线化。将数值结果与实验数据进行比较。
Recently Second Harmonic Generation (SHG) for the yellow exciton series in cuprous oxide has been demonstrated [J. Mund et al., Phys. Rev. B 98, 085203 (2018)]. Assuming perfect $O_{\mathrm{h}}$ symmetry, SHG is forbidden along certain high-symmetry axes. Perturbations can break this symmetry and forbidden transitions may become allowed. We investigate theoretically the effect of external magnetic fields on the yellow exciton lines of cuprous oxide. We identify two mechanisms by which an applied magnetic field can induce a second harmonic signal in a forbidden direction. First of all, a magnetic field by itself generally lifts the selection rules. In the Voigt configuration, an additional magneto-Stark electric field appears. This also induces certain SHG processes differing from those induced by the magnetic field alone. Complementary to the manuscript by A. Farenbruch et al. [Phys. Rev. B, submitted], we perform a full numerical diagonalization of the exciton Hamiltonian including the complex valence band structure. Numerical results are compared with experimental data.
