Special Colloquium - Brian Skinner (Massachusetts Institute of Technology) " Semimetals Unlimited: How new materials are redefining what is possible in solid state electronics"

Image
Image
Brian Skinner
January 24, 2019
1:30PM - 2:30PM
Location
1080 Physics Research Building - Smith Seminar Room - Reception at 1:15 pm prior to talk

Date Range
Add to Calendar 2019-01-24 13:30:00 2019-01-24 14:30:00 Special Colloquium - Brian Skinner (Massachusetts Institute of Technology) " Semimetals Unlimited: How new materials are redefining what is possible in solid state electronics"

Modern electronics is built on semiconductors, whose usefulness comes from their ability to switch between acting like a metal and acting like an insulator. For practical applications, however, semiconductors face certain unavoidable limitations imposed by the physics of localization and by the disorder introduced any time additional electrons are injected. In this talk I discuss whether these same limitations apply to nodal semimetals, which are a novel class of three-dimensional materials that can be thought of as intermediate between metals and semiconductors. I show that, surprisingly, in a certain class of nodal semimetals the electronic mobility can far exceed the fundamental bound that constrains semiconductors. I then discuss the thermoelectric effect in semimetals, and show how the thermopower can grow without bound under the influence of a strong magnetic field. This large thermopower apparently enables the development of thermoelectric generators and refrigerators with record-large efficiency.

1080 Physics Research Building - Smith Seminar Room - Reception at 1:15 pm prior to talk Department of Physics physics@osu.edu America/New_York public
Description

Modern electronics is built on semiconductors, whose usefulness comes from their ability to switch between acting like a metal and acting like an insulator. For practical applications, however, semiconductors face certain unavoidable limitations imposed by the physics of localization and by the disorder introduced any time additional electrons are injected. In this talk I discuss whether these same limitations apply to nodal semimetals, which are a novel class of three-dimensional materials that can be thought of as intermediate between metals and semiconductors. I show that, surprisingly, in a certain class of nodal semimetals the electronic mobility can far exceed the fundamental bound that constrains semiconductors. I then discuss the thermoelectric effect in semimetals, and show how the thermopower can grow without bound under the influence of a strong magnetic field. This large thermopower apparently enables the development of thermoelectric generators and refrigerators with record-large efficiency.