Observation of moiré excitons in the twisted WS₂/WS₂ homostructure

Abstract

Moiré superlattices offer a fascinating platform for designing the properties of optical excitons. The moiré pattern can generate an ordered exciton array in space, making it possible for topological excitons...

Dynamics of Moiré Exciton in a Twisted MoSe2/WSe2 Heterobilayer

“…Moreover, the energy splitting of the bright lower singlet and higher triplet moiré exciton was evaluated to be ≈12 meV from the experimental results of the PL spectra, which is almost consistent with the theoretically calculated result. [44] Thus, the higher bright state with a longer decay time further supports our interpretation of the triplet moiré exciton state.…”

Exciton Emission in Molybdenum Telluride Homobilayers with Fine‐Tuned Twist‐Angles

“…These narrow peaks, marked by the arrows, could be associated with moiré potentials trapped excitons. [ 5,11 ] However, further evidence is necessary to confirm this in future studies. As the θ increases to 15° and 29°, the homobilayers are proposed to be direct bandgap semiconductors [ 18 ] with both the VBM and the CBM located at K valley as shown in Figure 2d.…”

“…However, a systematic study of the twisted MoTe 2 homobilayers has yet to be conducted due to the challenges of producing high-quality samples with well-controlled twist-angles. Nonetheless, the exciton emission of its family members [10][11][12][13] including WSe 2 , WS 2 , MoS 2 , and MoSe 2 , have been studied under different conditions of twist-angle, [14] doping level, [15] electrical displacement field, [16] and lattice reconstruction. [17] Recent density functional theory [18,19] calculations predict that the valence band maximum (VBM) point of the twisted homobilayer MoTe 2 shifts from the K valley to the Γ valley as the stacking order changes from the 3R to the 2H type.…”

Progress on 2D–2D heterostructured hybrid materials for efficient electrocatalysis

“…Graphene is one of the most widely used 2D substrates for epitaxial growth of 2D–2D hybrid materials such as graphene-TMDs 40,41 and graphene-MoC 2 . 42 In addition, h-BN has also been widely used as a 2D substrate material for epitaxial growth of graphene, 43 MoS 2 , 44 and WS 2 45 to form the corresponding 2D–2D hybrids.…”