Third-order polarizability of interlayer excitons in hetero-bilayers
arXiv:2106.11738 · doi:10.1103/PhysRevB.104.205433
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 --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 hetero--bilayer, discussing the various selection rules of intra--excitonic energy level transitions.
arXiv comment13 pages, 7 figures
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