Support

Support Options

Submit a Support Ticket

 

Local density of states

By Saumitra Raj Mehrotra1, Gerhard Klimeck1

1. Purdue University

Category

Animations

Published on

Abstract

The concept of general density of states (DOS) in devices is, by definition, spatially invariant. However, in the case of inhomogeneous materials or in quantum confined structures, the density of states can be resolved in space. This is known as local density of states, or LDOS.

The LDOS definition becomes particularly important in confined devices where quantum reflection causes spatial variation in the density of states. LDOS for a nanowire MOSFET is shown in this image. As the gate bias is increased, the confined energy levels are pushed down. The variation in density of states near the source is due to reflection from the potential barrier, and can also be seen.

Credits

Image rendered with nanoHUB tool OMENwire (http://nanohub.org/resources/omenwire)

Cite this work

Researchers should cite this work as follows:

  • Saumitra Raj Mehrotra; Gerhard Klimeck (2010), "Local density of states," http://nanohub.org/resources/8801.

    BibTex | EndNote

Tags

nanoHUB.org, a resource for nanoscience and nanotechnology, is supported by the National Science Foundation and other funding agencies. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.