Intrinsic exciton states mixing and non-linear optical properties in transition metal dichalcogenide monolayers

Abstract

Optical properties of transition metal dichalcogenides monolayers are controlled by the Wannier-Mott excitons forming a series of $1s$, $2s$, $2p$,... hydrogen-like states. We develop the theory of the excited excitonic states energy spectrum fine structure. We predict that $p$- and $s$-shell excitons are mixed due to the specific $D_{3h}$ point symmetry of the transition metal dichalcogenide monolayers. Hence, both $s$- and $p$-shell excitons are active in both single- and two-photon processes providing an efficient mechanism of second harmonic generation. The corresponding contribution to the nonlinear susceptibility is calculated.

13 pages, 6 figures

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• Influence of the effective layer thickness on the groundstate and excitonic properties of transition-metal dichalcogenide systems
• Second harmonic generation control in twisted bilayers of transition metal dichalcogenides
• Momentum-Resolved Exciton Coupling and Valley Polarization Dynamics in Monolayer WS${}_2$
• Second- and third-order optical susceptibilities in bidimensional semiconductors near excitons states
• Nonlinear optics in 2D materials: from classical to quantum
• Exciton fine structure splitting and linearly polarized emission in strained transition-metal dichalcogenide monolayers
• In-Plane Electric Field Induced Orbital Hybridization of Excitonic States In Monolayer WSe2
• Emergent bright excitons with Rashba spin-orbit coupling in atomic monolayers
• Nonlinear spectroscopy of excitonic states in transition metal dichalcogenides
• Microscopic theory of the polarizability of transition metal dichalcogenides excitons: Application to WSe2
• Formation of dark excitons in monolayer transition metal dichalcogenides by a vortex beam: optical selection rules
• Symmetry Classification for Alternating Excitons in Two-Dimensional Altermagnets
• Twistronics and moiré superlattice physics in 2D transition metal dichalcogenides
• Tunable resonant s-p mixing of excitons in van der Waals heterostructures
• Optical second and third harmonic generation on excitons in ZnSe/BeTe quantum wells
• Ultrafast Coherent Bandgap Modulation Probed by Parametric Nonlinear Optics
• Interlayer exciton mediated second harmonic generation in bilayer MoS2
• Long-living excited states of a 2D diamagnetic exciton
• Nonlinear optics in the electron-hole continuum in 2D semiconductors: two-photon transition, second harmonic generation and valley current injection