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Proceedings Paper

Theory of excitonic states in lead salt quantum dots
Author(s): M.O. Nestoklon; I. D. Avdeev; S. V. Goupalov
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Paper 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.

Paper Details

Date Published: 31 January 2020
PDF: 7 pages
Proc. SPIE 11288, Quantum Sensing and Nano Electronics and Photonics XVII, 112880S (31 January 2020); doi: 10.1117/12.2542847
Show Author Affiliations
M.O. Nestoklon, Ioffe Institute (Russian Federation)
I. D. Avdeev, Ioffe Institute (Russian Federation)
S. V. Goupalov, Ioffe Institute (Russian Federation)
Jackson State Univ. (United States)

Published in SPIE Proceedings Vol. 11288:
Quantum Sensing and Nano Electronics and Photonics XVII
Manijeh Razeghi; Jay S. Lewis; Giti A. Khodaparast; Pedram Khalili, Editor(s)

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