arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.07094cond-mat.mes-hall
收藏

电场和磁场中耦合量子阱中激子有效质量的增强

Exciton effective mass enhancement in coupled quantum wells in electric and magnetic fields

J. Wilkes, E. A. Muljarov

摘要:

本文计算了在垂直于量子阱平面的电场和磁场作用下半导体耦合量子阱中激子的态。在三维实空间中求解激子薛定谔方程,得到直接激子和间接激子的朗道能级。激子能级和振子强度的计算使得能够映射激子吸收光谱的电场和磁场依赖性。对于体系的基态,我们计算了玻尔半径、光学寿命、结合能和偶极矩。利用微扰方法计算了由于磁场引起的激子质量重整化。我们预测了激子基态有效质量对磁场的非单调依赖性。这样的趋势是解释在一个经典的图片,在基态从一个间接的直接激子与增加磁场。

英文摘要:

We present a calculation of exciton states in semiconductor coupled quantum wells (CQWs) in the presence of electric and magnetic fields applied perpendicular to the QW plane. The exciton Schrödinger equation is solved in real space in three dimensions to obtain the Landau levels of both direct and indirect excitons. Calculation of the exciton energy levels and oscillator strengths enables mapping of the electric and magnetic field dependence of the exciton absorption spectrum. For the ground state of the system, we evaluate the Bohr radius, optical lifetime, binding energy and dipole moment. The exciton mass renormalization due to the magnetic field is calculated using a perturbative approach. We predict a non-monotonous dependence of the exciton ground state effective mass on magnetic field. Such a trend is explained in a classical picture, in terms of the ground state tending from an indirect to a direct exciton with increasing magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑