Trion-Induced Negative Photoconductivity in Monolayer

Trion-induced negative photoconductivity in monolayer MoS2.

Optical excitation typically enhances electrical conduction and low-frequency radiation absorption in semiconductors. We, however, observe a pronounced transient decrease of conductivity in doped monolayer molybdenum disulfide (MoS(2)), a two-dimensional (2D) semiconductor, using ultrafast optical-pump terahertz-probe spectroscopy. In particular, the conductivity is reduced to only 30% of its e...

Valley polarized relaxation and upconversion luminescence from Tamm-Plasmon Trion-Polaritons with a MoSe2 monolayer

Exciton and Trion Dynamics in Bilayer MoS₂

PL spectra from bilayer MoS 2 could not be tuned by electric fi eld at room temperature owing to its indirect band gap manner, [ 7 ] which makes the exciton and trion dynamics in bilayer MoS 2 still underexplored. In this paper, we demonstrate the valley control of exciton and trion dynamics in bilayer MoS 2 , via the comodulations by both temperature and electric fi eld. We found that as tempe...

Exciton and Trion Dynamics in Bilayer MoS

PL spectra from bilayer MoS 2 could not be tuned by electric fi eld at room temperature owing to its indirect band gap manner, [ 7 ] which makes the exciton and trion dynamics in bilayer MoS 2 still underexplored. In this paper, we demonstrate the valley control of exciton and trion dynamics in bilayer MoS 2 , via the comodulations by both temperature and electric fi eld. We found that as tempe...

Trion fine structure and coupled spin–valley dynamics in monolayer tungsten disulfide

Monolayer transition-metal dichalcogenides have recently emerged as possible candidates for valleytronic applications, as the spin and valley pseudospin are directly coupled and stabilized by a large spin splitting. The optical properties of these two-dimensional crystals are dominated by tightly bound electron-hole pairs (excitons) and more complex quasiparticles such as charged excitons (trio...