Calculation of the nonlinear response functions of intra-exciton transitions in two-dimensional transition metal dichalcogenides

Abstract

In this paper, we study the third-order nonlinear optical response due to transitions between excitonic levels in two-dimensional transition metal dichalcogeniedes. To accomplish this, we use methods not applied to the description of excitons in two-dimensional materials so far and combined with a variational approach to describe the $1s$ excitonic state. The aforementioned transitions allow to probe dark states which are not revealed in absorption experiments. We present general formulas capable of describing any third-order process. The specific case of two-photon absorption in WSe2 is studied. The case of the circular well is also studied as a benchmark of the theory.

11 pages, 5 figures

References in corpus (4)

• Optical signature of symmetry variations and spin-valley coupling in atomically thin tungsten dichalcogenides
• 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
• A colloquium on the variational method applied to excitons in 2D materials

Cited by in corpus (5)

• Theoretical methods for excitonic physics in two-dimensional materials
• Defect engineering in two-dimensional pentagonal PdTe${}_2$: Tuning electronic, optical, and magnetic properties
• Tunable Excitons in Rhombohedral Trilayer Graphene
• Retrieval of material properties of monolayer transition-metal dichalcogenides from magnetoexciton energy spectra
• Third-order polarizability of interlayer excitons in hetero-bilayers