Support Options

Submit a Support Ticket

Home Online Presentations Lecture 1A: What and where is the resistance? About

Lecture 1A: What and where is the resistance?

By Supriyo Datta

Purdue University

Published on


Figure 1 Objective: To introduce a simple quantitative model that highlights the essential parameters that determine electrical conduction: the density of states in the channel, D and the rates at which electrons hop in and out of the two contacts, labeled source and drain. This model is used to explain diverse phenomena such as (1) why a small conductor has a maximum conductance that it cannot exceed even with the best of contacts, (2) how this conductance quantum evolves into Ohm’s law for large conductors, (3) how even a hydrogen atom can exhibit thermoelectric effects, (4) how even symmetric devices can be rectifying due to asymmetric electrostatics, and (5) how the “voltage” varies spatially inside a nanoscale device.

This lecture is part 1 of 2.

Sponsored by

Cite this work

Researchers should cite this work as follows:

  • Supriyo Datta (2008), "Lecture 1A: What and where is the resistance?,"

    BibTex | EndNote



Purdue University, West Lafayette, IN

Tags, 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.