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Tunable band gaps and optical absorption properties of bent MoS2 nanoribbons
Tang, Hong Neupane, Bimal Neupane, Santosh Ruan, Shiqi Ruzsinszky, Adrienn
Tang, Hong
Neupane, Bimal
Neupane, Santosh
Ruan, Shiqi
Ruzsinszky, Adrienn
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Journal article
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2022-02-22
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Physics
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http://dx.doi.org/10.1038/s41598-022-06741-3
Abstract
The large tunability of band gaps and optical absorptions of armchair MoS2 nanoribbons of diferent widths under bending is studied using density functional theory and many-body perturbation GW and Bethe–Salpeter equation approaches. We fnd that there are three critical bending curvatures, and the non-edge and edge band gaps generally show a non-monotonic trend with bending. The nondegenerate edge gap splits show an oscillating feature with ribbon width n, with a period Δn = 3,
due to quantum confnement efects. The complex strain patterns on the bent nanoribbons control the varying features of band structures and band gaps that result in varying exciton formations and optical properties. The binding energy and the spin singlet–triplet split of the exciton forming the lowest absorption peak generally decrease with bending curvatures. The large tunability of optical properties of bent MoS2 nanoribbons is promising and will fnd applications in tunable optoelectronic
nanodevices.
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Tang, H., Neupane, B., Neupane, S. et al. Tunable band gaps and optical absorption properties of bent MoS2 nanoribbons. Sci Rep 12, 3008 (2022). https://doi.org/10.1038/s41598-022-06741-3
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Nature Research
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Scientific Reports, Vol. 12
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