Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session A37: Focus Session: Complex Oxide Thin Films -- Conductivity at Oxide Interfaces
8:00 AM–11:00 AM,
Monday, March 15, 2010
Sponsoring Units: DMP GMAG
Chair: Andy Millis, Columbia
Abstract ID: BAPS.2010.MAR.A37.2
Abstract: A37.00002 : Electric Field Tuned Crossover From Semi-Classical to Weakly Localized Quantum Transport in a Quasi 2-Dimensional Electron Gas in SrTiO$_3$*
8:36 AM–8:48 AM
Preview Abstract Abstract
K. Le Hur
(Department of Applied Physics and Center for Research on Interface Structures and Phenomena, Yale University)
Quasi 2-dimensional electron gases (Q2DEG) created by doping SrTiO$_3$ (STO) near interfaces and surfaces, have attracted considerable attention. These oxide Q2DEG's potentially offer a wide range of tunable behavior due to the extraordinary properties of STO. Here, we present electric field tuned magnetotransport measurements of a Q2DEG created by Ar- irradiation. The electric field, applied through a back gate bias, modulates both the mobility and sheet density, with a greater effect on the former. For high mobilities, the magnetotransport obeys Kohler's rule, consistent with semi- classical transport. As the mobility is decreased, violation of Kohler's rule is observed and weakly localized quantum transport emerges. This electric field tuned crossover arises from a modulation in the carrier confinement, which is enhanced by the electric field dependent dielectric constant of STO, as shown through self-consistent solutions to the Poisson and Schr\"odinger equations. The implications of our results on the development of oxide electronic devices will be discussed.
*This work was supported by the NSF.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.A37.2
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700