论文标题
观察CDSE纳米片中激子的量化运动
Observation of the quantized motion of excitons in CdSe nanoplatelets
论文作者
论文摘要
我们表明，超薄CDSE纳米片的有限侧尺寸强烈影响其光致发光和光吸收光谱。这与量子井的情况形成鲜明对比，量子井的情况可以假定较大的侧向尺寸是无限的。纳米片的侧尺寸在几个至数十纳米的范围内变化。对于这些尺寸，激子经历了平面量子限制，并且它们的质量运动被量化。我们可以根据简单的粒子中的模型对激子质量状态的离散化的直接实验观察可以很好地理解。
We show that the finite lateral sizes of ultrathin CdSe nanoplatelets strongly affect both their photoluminescence and optical absorption spectra. This is in contrast to the situation in quantum wells, in which the large lateral sizes may be assumed to be infinite. The lateral sizes of the nanoplatelets are varied over a range of a few to tens of nanometers. For these sizes excitons experience in-plane quantum confinement, and their center-of-mass motion becomes quantized. Our direct experimental observation of the discretization of the exciton center-of-mass states can be well understood on the basis of the simple particle-in-a-box model.
