Surface States - Extrinsic Surface States

Extrinsic Surface States

Surface states originating from clean and well ordered surfaces are usually called intrinsic. These states include states originating from reconstructed surfaces, where the two-dimensional translational symmetry gives rise to the band structure in the k space of the surface.

Extrinsic surface states are usually defined as states not originating from a clean and well ordered surface. Surfaces that are fit into the category extrinsic are :

  1. Surfaces with defects, where the translational symmetry of the surface is broken.
  2. Surfaces with adsorbates
  3. Interfaces between two material such as a semiconductor-oxide or semiconductor-metal interfaces
  4. Interfaces between solid and liquid phases.

Generally for extrinsic surface states is that they cannot easily be characterized in terms of their chemical, physical or structural properties.

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