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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• Excitons in atomically thin transition metal dichalcogenides
• In-plane Propagation of Light in Transition Metal Dichalcogenide Monolayers: Optical Selection Rules
• Exciton-exciton interaction in transition-metal dichalcogenide monolayers
• Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor
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• Tuning the Fröhlich exciton-phonon scattering in monolayer MoS2
• Guide to optical spectroscopy of layered semiconductors
• Giant optical nonlinearities from Rydberg-excitons in semiconductor microcavities
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• Influence of the effective layer thickness on the groundstate and excitonic properties of transition-metal dichalcogenide systems
• Excitonic structure of the optical conductivity in MoS${}_2$ monolayers
• Optical Selection Rule of Excitons in Gapped Chiral Fermion Systems
• Second harmonic generation control in twisted bilayers of transition metal dichalcogenides
• Autoionization and dressing of excited excitons by free carriers in monolayer WSe2
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• Second- and third-order optical susceptibilities in bidimensional semiconductors near excitons states
• High-Resolution Second Harmonic Generation Spectroscopy with Femtosecond Laser Pulses on Excitons in Cu${}_2$O
• Two-photon absorption in two-dimensional materials: The case of hexagonal boron nitride
• Nonlinear optics in 2D materials: from classical to quantum
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• Magneto-Stark and Zeeman effect as origin of second harmonic generation of excitons in Cu${}_2$O
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• In-Plane Electric Field Induced Orbital Hybridization of Excitonic States In Monolayer WSe2
• Emergent bright excitons with Rashba spin-orbit coupling in atomic monolayers
• Expeditious computation of nonlinear optical properties of arbitrary order with native electronic interactions in the time domain
• Rotons in Optical Excitation Spectra of Monolayer Semiconductors
• Nonlinear spectroscopy of excitonic states in transition metal dichalcogenides
• Third harmonic generation on exciton-polaritons in bulk semiconductors subject to a magnetic field
• 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
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• 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
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