Exciton complexes in low dimensional transition metal dichalcogenides

Abstract

We examine the excitonic properties of layered configurations of low dimensional transition metal dichalcogenides (LTMDCs) using the fractional dimensional space approach. The binding energies of the exciton, trion and biexciton in LTMDCs of varying layers are analyzed, and linked to the dimensionality parameter $\alpha$, which provides insight into critical electro-optical properties (relative oscillator strength, absorption spectrum, exciton-exciton interaction) of the material systems. The usefulness of $\alpha$ is highlighted by its independence of the physical mechanisms underlying the confinement effects of geometrical structures. Our estimates of the binding energies of exciton complexes for the monolayer configuration of transition metal dichalcogenides suggest a non-collinear structure for the trion and a positronium-molecule-like square structure for the biexciton.

8 pages, edits

References in corpus (3)

• Quasiparticle band structures and optical properties of strained monolayer MoS2 and WS2
• Light Generation and Harvesting in a Van der Waals Heterostructure
• Screening in 2D: GW calculations for surfaces and thin films using the repeated-slab approach

Cited by in corpus (4)

• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Exciton formation assisted by longitudinal optical phonons in monolayer transition metal dichalcogenides
• Generalized scaling law for exciton binding energy in two-dimensional materials
• Influence of the Pauli exclusion principle on scattering properties of cobosons