Symmetry, Dimension, and Spin: Understanding transport in 2D 'phosphorene'

By Ian Appelbaum

Department of Physics, University of Maryland, College Park, MD

View Presentation

Additional materials available (4)

Licensed under General Performance Usage.

Published on


Despite its low atomic number and inversion symmetry, recent electronic measurements demonstrate that (group-IV) graphene has a greatly disappointing spin lifetime, corroborated by theory showing strong spin-flip scattering by flexural (out-of-plane) phonons. There exists a class of graphene-like 2-dimensional semiconductors formed from elemental group-IV OR group V atoms, some of which may be immune to this deleterious coupling. Only one is known to mechanically exfoliate like graphene: phosphorene (monolayer black phosphorus). We analyzed the symmetry of its electronic bandstructure including spin-orbit interaction close to the insulating gap edge with special interest in the spin-transport properties. Importantly, we discovered that the natural buckling of the honeycomb crystal lattice results in anisotropic spin flip processes that are entirely decoupled from flexural phonons for a particular in-plane spin orientation. This discovery allows us to predict a spin lifetime comparable to bulk Si, vastly greater than graphene. 

Sponsored by

Cite this work

Researchers should cite this work as follows:

  • Ian Appelbaum (2015), "Symmetry, Dimension, and Spin: Understanding transport in 2D 'phosphorene',"

    BibTex | EndNote



203 Physics, Purdue University, West Lafayette, IN