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Dimensionality and anisotropicity dependence of radiative recombination in nanostructured phosphorene

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Abstract

The interplay between dimensionality and anisotropicity leads to intriguing optoelectronic properties and exciton dynamics in low dimensional semiconductors. In this study we use nanostructured phosphorene as a prototypical example to unfold such complex physics and develop a general first-principles framework to study exciton dynamics in low dimensional systems. Specifically we derived the radiative lifetime and light emission intensity from 2D to 0D systems based on many body perturbation theory, and investigated the dimensionality and anisotropicity effects on radiative recombination lifetime both at 0 K and finite temperature, as well as polarization and angle dependence of emitted light. We show that the radiative lifetime at 0 K increases by an order of 103 with the lowering of one dimension (i.e. from 2D to 1D nanoribbons or from 1D to 0D quantum dots). We also show that obtaining the radiative lifetime at finite temperature requires accurate exciton dispersion beyond the effective mass approximation. Finally, we demonstrate that monolayer phosphorene and its nanostructures always emit linearly polarized light consistent with experimental observations, different from in-plane isotropic 2D materials like MoS2 and h-BN that can emit light with arbitrary polarization, which may have important implications for quantum information applications.

Graphical abstract: Dimensionality and anisotropicity dependence of radiative recombination in nanostructured phosphorene

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Publication details

The article was received on 25 Apr 2019, accepted on 03 Jun 2019 and first published on 03 Jun 2019


Article type: Paper
DOI: 10.1039/C9TC02214G
J. Mater. Chem. C, 2019, Advance Article

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    Dimensionality and anisotropicity dependence of radiative recombination in nanostructured phosphorene

    F. Wu, D. Rocca and Y. Ping, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC02214G

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