Third-order polarizability of interlayer excitons in hetero-bilayers

Abstract

In this paper, we employ a fully microscopic approach to the study of interlayer excitons in hetero-bilayers. We use Fowler's and Karplus' method to access the dynamical polarizability of non--interacting interlayer excitons in a ${\mathrm{WSe}}_2/{\mathrm{WS}}_2$--based van der Waals heterostructure. Following from the calculation of the linear polarizability, we consider Svendsen's variational method to the calculation of the dynamic third--order polarizability. With this variational method, we study both two--photon absorption and third--harmonic generation processes for interlayer excitons in a ${\mathrm{WSe}}_2/{\mathrm{WS}}_2$ hetero--bilayer, discussing the various selection rules of intra--excitonic energy level transitions.

13 pages, 7 figures

References in corpus (10)

• Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides
• Ultrafast transition between exciton phases in van der Waals heterostructures
• Nonlinear twistoptics at symmetry-broken interfaces
• Optical spectroscopy of excited exciton states in MoS2 monolayers in van der Waals heterostructures
• Nonlinear optical selection rules of excitons in monolayer transition metal dichalcogenides
• Second-Harmonic Young Interference in Atom-Thin Heterocrystals
• A colloquium on the variational method applied to excitons in 2D materials
• Calculation of the nonlinear response functions of intra-exciton transitions in two-dimensional transition metal dichalcogenides
• Tunable plasmon-enhanced second-order optical nonlinearity in transition metal dichalcogenide nanotriangles
• Microscopic theory of the polarizability of transition metal dichalcogenides excitons: Application to WSe2

Cited by in corpus (2)

• Theoretical methods for excitonic physics in two-dimensional materials
• Tunable Excitons in Rhombohedral Trilayer Graphene