We present a computer simulation of exciton-exciton scattering in a quantumwell. Specifically, we use quantum Monte Carlo techniques to study the boundand continuum states of two excitons in a 10 nm wideGaAs/Al$_{0.3}$Ga$_{0.7}$As quantum well. From these bound and continuum stateswe extract the momentum-dependent phase shifts for s-wave scattering. Asurprising finding of this work is that a commonly studied effective-mass modefor excitons in a 10 nm quantum well actually supports two bound biexcitonstates. The second, weakly bound state may dramatically enhance exciton-excitoninteractions. We also fit our results to a hard-disk model and indicatedirections for future work.
展开▼
机译：我们提出了量子阱中激子-激子散射的计算机模拟。具体来说，我们使用量子蒙特卡洛技术研究了10nm宽的GaAs / Al $ _ {0.3} $ Ga $ _ {0.7} $ As量子阱中两个激子的界和连续态。从这些束缚态和连续态中，我们提取了与动量相关的相移，用于s波散射。这项工作的令人惊讶的发现是，在10 nm量子阱中，通常研究的激子有效质量模式实际上支持两个键合的双激态。第二弱结合状态可以显着增强激子-激子相互作用。我们还将结果拟合到硬盘模型中，并指出将来的工作方向。
展开▼
