Rashba exciton in a 2D perovskite quantum dot

Swift, Michael W.; Lyons, John L.; Efros, Alexander L.; Sercel, Peter C.

doi:10.1039/d1nr04884h

Rashba exciton in a 2D perovskite quantum dot

Journal Article · Mon Oct 04 00:00:00 EDT 2021 · Nanoscale

DOI:https://doi.org/10.1039/d1nr04884h· OSTI ID:1982212

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U.S. Naval Research Laboratory, Washington, D.C. (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States); Center for Hybrid Organic Inorganic Semiconductors for Energy, Golden, CO (United States)

The Rashba effect has been proposed to give rise to a bright exciton ground state in halide perovskite nanocrystals (NCs), resulting in very fast radiative recombination at room temperature and extremely fast radiative recombination at low temperature. In this paper we find the dispersion of the “Rashba exciton”, i.e., the exciton whose bulk dispersion reflects large spin–orbit Rashba terms in the conduction and valence bands and thus has minima at non-zero quasi-momenta. Placing Rashba excitonsin quasi-2D cylindrical quantum dots, we calculate size-dependent levels of confined excitons and their oscillator transition strengths. Here, we consider the implications of this model for two-dimensional hybrid organic–inorganic perovskites, discuss generalizations of this model to 3D NCs, and establish criteria under which a bright ground exciton state could be realized.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE)

Sponsoring Organization:: USDOE

OSTI ID:: 1982212

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 39 Vol. 13; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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