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Paper   IPM / Nano-Sciences / 14381
School of Nano Science
  Title:   Excitons and optical spectra of phosphorene nanoribbons
  Author(s): 
1 . Zahra Nourbakhsh
2 . Reza Asgari
  Status:   Published
  Journal: Phys. Rev. B
  No.:  3
  Vol.:  94
  Year:  2016
  Pages:   035437
  Publisher(s):   American Physical Society
  Supported by:  IPM
  Abstract:
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 di erent size of PNRs. The typically strong splitting between singlet and triplet excitonic states make PNRs favorable systems for application. Quantum con nement 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 rst bright excitonic state in PNRs is explored in detail.

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