Theory of excitonic states in lead salt quantum dots

M.O. Nestoklon; I. D. Avdeev; S. V. Goupalov

doi:10.1117/12.2542847

31 January 2020 Theory of excitonic states in lead salt quantum dots

M.O. Nestoklon, I. D. Avdeev, S. V. Goupalov

Proceedings Volume 11288, Quantum Sensing and Nano Electronics and Photonics XVII; 112880S (2020) https://doi.org/10.1117/12.2542847
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Band-edge exciton states in bulk lead chalcogenides are 64-fold degenerate. In quantum dots (QDs), the degeneracy is lifted by the valley mixing and the electron-hole exchange interaction. To investigate their interplay we calculate excitonic states in PbS QDs within the tight-binding method. This allows one to trace the genesis of the bright excitonic states from the valley-degenerate states of the direct exciton which may be described within the effective mass model. We compute optical absorption spectra fully accounting for the exciton fine structure within the tight-binding method and extend the effective-mass model to include description of the inter-valley coupling.

Conference Presentation

Citation Download Citation

M.O. Nestoklon, I. D. Avdeev, and S. V. Goupalov "Theory of excitonic states in lead salt quantum dots", Proc. SPIE 11288, Quantum Sensing and Nano Electronics and Photonics XVII, 112880S (31 January 2020); https://doi.org/10.1117/12.2542847

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