Coulomb-bound four- and five-particle intervalley states in an atomically-thin semiconductor.

ABSTRACT: As hosts for tightly-bound electron-hole pairs carrying quantized angular momentum, atomically-thin semiconductors of transition metal dichalcogenides (TMDCs) provide an appealing platform for optically addressing the valley degree of freedom. In particular, the valleytronic properties of neutral and charged excitons in these systems have been widely investigated. Meanwhile, correlated quantum states involving more particles are still elusive and controversial despite recent efforts. Here, we present experimental evidence for four-particle biexcitons and five-particle exciton-trions in high-quality monolayer tungsten diselenide. Through charge doping, thermal activation, and magnetic-field tuning measurements, we determine that the biexciton and the exciton-trion are bound with respect to

SUBMITTER: Chen SY 

PROVIDER: S-EPMC6137189 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature