Quantum mechanics

Materials science

Photoluminescence

Semiconductor

Band gap

Physics

Nanotechnology

Direct and indirect band gaps

Condensed matter physics

Monolayer

Nanomaterials

Electron

Nanoscopic scale

Quantum dot

Optoelectronics

Nano Letters

Novel physical phenomena can emerge in low-dimensional nanomaterials. Bulk MoS2, a prototypical metal dichalcogenide, is an indirect bandgap semiconductor with negligible photoluminescence. When the MoS2 crystal is thinned to monolayer, however, a strong photoluminescence emerges, indicating an indirect to direct bandgap transition in this d-electron system. This observation shows that quantum confinement in layered d-electron materials like MoS2 provides new opportunities for engineering the electronic structure of matter at the nanoscale.

Emerging Photoluminescence in Monolayer MoS<sub>2</sub>

Emerging Photoluminescence in Monolayer MoS2

Emerging Photoluminescence in Monolayer MoS₂