In-Situ Charge-Density Imaging Of Metamaterials Made With Switchable Two-Dimensional Electron Gas At Oxide Heterointerfaces
Abstract
The recent discovery of a two-dimensional electron gas (2DEG) at the interface between insulating perovskite oxides SrTiO3 and LaAlO3 was made possible by advances in atomic layer controlled growth. It has been demonstrated that the conducting layer can be localized within a few nm of the interface, and that the carrier concentration can be altered with an electric field. The project will for the first time directly image the 2DEG state resulting from these modifications. This unprecedented control can lead to entirely new phenomena. For instance, our theoretical analysis has predicted that reversing the electric polarization of an adjacent insulating ferroelectric layer will switch the 2DEG between high and low conductance states. This change, as well as the change in spatial distribution of the charge, will be directly imaged by in-situ TEM holography
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Dec 05, 2016
- Source ID
- FA23861614025
Entities
People
- Chang Beom Eom
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Wisconsin System