Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session Y09: Two-Dimensional Phases in Oxide Heterostructures
11:15 AM–1:27 PM,
Friday, March 9, 2018
LACC Room: 301A
Sponsoring Unit: DMP
Chair: Ankit Disa, Max Planck Inst Structure & Dynamics of Matter
Abstract: Y09.00003 : Tuning the Rashba Effect with Electrical Gating of Ultra-thin LaTiO3/SrTiO3 Heterostructures*
11:39 AM–11:51 AM
(University of Toulouse)
(Los Alamos National Laboratory)
(University of Duisburg-Essen)
Emergent metallic behavior at the interface of the Mott insulator LaTiO3 and the band insulator SrTiO3 has been explained in terms of charge redistribution at the interface combined with strain-induced electronic structure modification. We have studied ultra thin (3 unit cells) films of LaTiO3 and found evidence for a giant Rashba effect from quantum oscillations with an associated Berry phase, weak antilocalization in the magnetoresistance, and anisotropic in-plane magnetoresistance. In order to tune these properties, we have electrically back-gated these films. We have found a transition from a nonlinear to a linear Hall effect, a change in sign of the magnetoresistance, and, most interestingly, a peak in the zero field resistance. Based on density functional theory calculations, we attribute the nonlinear to linear Hall effect transition to an emptying of a dxz+yz band. The peak is attributed to tuning the Fermi energy across a Rashba effect induced Dirac point.
*Supported by the Vannevar Bush Faculty Fellowship of the Department of Defense under Contract No. N00014-15-1-0045 and the National Science Foundation Graduate Fellowship.
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