三极管
比克西顿
激子
结合能
凝聚态物理
电介质
材料科学
单层
物理
原子物理学
纳米技术
光电子学
作者
Ilkka Kylänpää,Hannu‐Pekka Komsa
出处
期刊:Physical Review B
[American Physical Society]
日期:2015-11-16
卷期号:92 (20)
被引量:223
标识
DOI:10.1103/physrevb.92.205418
摘要
Excitons, trions, biexcitons, and exciton-trion complexes in two-dimensional transition metal dichalcogenide sheets of MoS$_2$, MoSe$_2$, MoTe$_2$, WS$_2$ and WSe$_2$ are studied by means of density functional theory and path integral Monte Carlo method in order to accurately account for the particle-particle correlations. In addition, the effect of dielectric environment on the properties of these exciton complexes is studied by modifying the effective interaction potential between particles. Calculated exciton and trion binding energies are consistent with previous experimental and computational studies, and larger systems such as biexciton and exciton-trion complex are found highly stable. Binding energies of biexcitons are similar or higher than those of trions, but the binding energy of the trion depends significantly stronger on the dielectric environment than that of biexciton. Therefore, as a function of an increasing dielectric constant of the environment the exciton-trion complex "dissociates" to a biexciton rather than to an exciton and a trion.
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