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Paper   IPM / Physic / 14378
School of Physics
  Title:   Excitons and optical spectra of phosphorene nanoribbons
1.  Z. Nourbakhsh
2.  R. Asgari
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  94
  Year:  2016
  Pages:   035437
  Publisher(s):   Published 22 July 2016
  Supported by:  IPM
On the basis of many-body ab-initio calculations, using single-shot G0W0 method and Bethe-Salpeter equation, we study phosphorene nanoribbons (PNRs) in the two typical zigzag and armchair directions. The electronic structure, optical absorption, electron-hole (exciton) binding energy, exciton exchange splitting, and exciton wave-functions are calculated for different size of PNRs. The typically strong splitting between singlet and triplet excitonic states make PNRs favorable systems for application. Quantum confinement occurs in both kind of PNRs, and it is stronger in the zPNRs, as behave like quasi-zero-dimensional systems. Scaling laws are investigated for the size dependent behaviors of PNRs. The first bright excitonic state in PNRs is explored in detail.

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