论文标题
在高度激发的CDSE纳米片中的biexcitons
Biexcitons in Highly Excited CdSe Nanoplatelets
论文作者
论文摘要
我们介绍了高度激发的CDSE纳米片段中的自由电荷（电子和孔），激子和Biexcitons的相图，这些纳米片片可预测在易于达到的低温或高光兴奋密度下的Biexciton主导区域的交叉。我们的发现通过将Biexcitons引入状态方程来扩展了以前的工作，仅描述了自由电荷和激子，同时鉴于该材料中相对较低的自由电荷密度相对较低。我们的预测在不久的将来是可以在实验上测试的，并提供了产生量子变性，甚至可能是超氟的biexciton气体的前景。此外，我们还提供了简单的表达式，从而有助于对光激发密度和温度的模式进行分析见解，其中激素和Biexcitons主导了纳米片的响应。
We present the phase diagram of free charges (electrons and holes), excitons, and biexcitons in highly excited CdSe nanoplatelets that predicts a crossover to a biexciton-dominated region at easily attainable low temperatures or high photoexcitation densities. Our findings extend previous work describing only free charges and excitons by introducing biexcitons into the equation of state, while keeping the exciton and biexciton binding energies constant in view of the relatively low density of free charges in this material. Our predictions are experimentally testable in the near future and offer the prospect of creating a quantum degenerate, and possibly even superfluid, biexciton gas. Furthermore, we also provide simple expressions giving analytical insight into the regimes of photoexcitation densities and temperatures in which excitons and biexcitons dominate the response of the nanoplatelets.
