Excitons in a disordered medium: A numerical study in InGaN quantum wells
Excitons in a disordered medium: A numerical study in InGaN quantum wells
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无序介质中的激子:InGaN 量子阱的数值研究
DOI:
10.1103/physrevresearch.4.043004
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发表时间:
2022
影响因子:
4.2
通讯作者:
Weisbuch, Claude
中科院分区:
文献类型:
--
作者:
David, Aurelien;Weisbuch, Claude
Excitons in InGaN quantum wells are investigated numerically, considering random alloy disorder and Coulomb interaction on equal footing in the Schrödinger equation. Their statistical properties are systemically explored as a function of the quantum well thickness and composition, revealing a complex competition between disorder-induced carrier localization, Coulomb attraction, and field-induced wave function separation. This results in a class of semiconductor quasiparticle with hybrid properties in between hydrogenoid excitons and disorder-localized free particles. Exciton screening by free carriers is investigated and shows distinct behavior from the screening of bulk excitons. Finally, a highly accurate approximate solution of the excitonic Schrödinger equation, with reduced numerical complexity, is introduced.
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