Neutral and charged inter-valley biexcitons in monolayer MoSe₂.

ABSTRACT: In atomically thin transition metal dichalcogenides (TMDs), reduced dielectric screening of the Coulomb interaction leads to strongly correlated many-body states, including excitons and trions, that dominate the optical properties. Higher-order states, such as bound biexcitons, are possible but are difficult to identify unambiguously using linear optical spectroscopy methods. Here, we implement polarization-resolved two-dimensional coherent spectroscopy (2DCS) to unravel the complex optical response of monolayer MoSe₂ and identify multiple higher-order correlated states. Decisive signatures of neutral and charged inter-valley biexcitons appear in cross-polarized two-dimensional spectra as distinct resonances with respective ∼20 and ∼5 meV binding energies-similar to recent calcu

SUBMITTER: Hao K 

PROVIDER: S-EPMC5493760 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature