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 :
- Surfaces with defects, where the translational symmetry of the surface is broken.
- Surfaces with adsorbates
- Interfaces between two material such as a semiconductor-oxide or semiconductor-metal interfaces
- 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.
Read more about this topic: Surface States
Famous quotes containing the words extrinsic, surface and/or states:
“Authors communicate with the people by some special extrinsic mark; I am the first to do so by my entire being, as Michel de Montaigne.”
—Michel de Montaigne (15331592)
“We say justly that the weak person is flat, for, like all flat substances, he does not stand in the direction of his strength, that is, on his edge, but affords a convenient surface to put upon. He slides all the way through life.... But the brave man is a perfect sphere, which cannot fall on its flat side and is equally strong every way.”
—Henry David Thoreau (18171862)
“I cannot say what poetry is; I know that our sufferings and our concentrated joy, our states of plunging far and dark and turning to come back to the worldso that the moment of intense turning seems still and universalall are here, in a music like the music of our time, like the hero and like the anonymous forgotten; and there is an exchange here in which our lives are met, and created.”
—Muriel Rukeyser (19131980)