Tunable exciton-polaritons in band-gap engineered hexagonal boron nitride

Pedro Ninhos; Christos Tserkezis; N. Asger Mortensen; Nuno Peres

doi:10.1117/12.3016546

20 June 2024 Tunable exciton-polaritons in band-gap engineered hexagonal boron nitride

Pedro Ninhos, Christos Tserkezis, N. Asger Mortensen, Nuno Peres

Proceedings Volume PC13004, Nonlinear Optics and its Applications 2024; PC130040E (2024) https://doi.org/10.1117/12.3016546
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

We show that hexagonal boron nitride (hBN), a two-dimensional insulator supports tunable excitons in the near and middle ultraviolet if subjected to an external superlattice potential. Our calculations predict that as we increase the strength of the potential, the gap reduces, and the anisotropy of the dispersion is enhanced. Consequently, the binding-energies of the excitons decrease, leading to a red-shift of the excitonic levels. We also observe that the absorption is reduced when we change the polarization from along the periodicity of the potential to perpendicular to it, with the system acting as an optical polarizer. As we reduce the gap, the characteristic frequency range for which we can excite exciton-polaritons red-shifts as well. These modes behave quite differently from pristine hBN in extreme cases where the anisotropy of the system grows indefinitely. In this way, by tuning the potential, we can manipulate the excitonic and sub-gap optical properties of hBN.

Conference Presentation

Citation Download Citation

Pedro Ninhos, Christos Tserkezis, N. Asger Mortensen, and Nuno Peres "Tunable exciton-polaritons in band-gap engineered hexagonal boron nitride", Proc. SPIE PC13004, Nonlinear Optics and its Applications 2024, PC130040E (20 June 2024); https://doi.org/10.1117/12.3016546

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