双层膜系统中激子和双激子的能量
Exciton and biexciton energies in bilayer systems
摘要：
我们报告的激子和双激子的能量在理想的二维双层系统内的有效质量近似与各向同性的电子和空穴质量的计算。激子能量由一个简单的数值积分技术获得，而双激子能量由扩散量子蒙特卡罗计算获得。激子的结合能衰减为层的分离的倒数，而双激子的结合能相对于解离成两个单独的激子呈指数衰减。
英文摘要：
We report calculations of the energies of excitons and biexcitons in ideal two-dimensional bilayer systems within the effective-mass approximation with isotropic electron and hole masses. The exciton energies are obtained by a simple numerical integration technique, while the biexciton energies are obtained from diffusion quantum Monte Carlo calculations. The exciton binding energy decays as the inverse of the separation of the layers, while the binding energy of the biexciton with respect to dissociation into two separate excitons decays exponentially.
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