Publication details

Electric-Field- Induced Polar Order and Localization of the Confined Electrons in LaAlO3/SrTiO3 Heterostructures

Investor logo
Authors

ROESSLE M. KIM K W DUBROKA Adam MARŠÍK Přemysl WANG C N JANY R. RICHTER C. MANNHART J. SCHNEIDER C W FRANO A. WOCHNER P. LU Y. KEIMER B. SHUKLA D K STREMPFER J. BERNHARD Christian

Year of publication 2013
Type Article in Periodical
Magazine / Source Physical Review Letters
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://prl.aps.org/pdf/PRL/v110/i13/e136805
Doi http://dx.doi.org/10.1103/PhysRevLett.110.136805
Field Solid matter physics and magnetism
Keywords STRONTIUM-TITANATE; PHASE-TRANSITION; FERROELECTRICITY; LAALO3/SRTIO3; SRTIO3; ELLIPSOMETRY; FREQUENCIES; PEROVSKITE; DEPENDENCE; INTERFACES
Description With ellipsometry, x-ray diffraction, and resistance measurements we investigated the electric-field effect on the confined electrons at the LaAlO3=SrTiO3 interface. We obtained evidence that the localization of the electrons at negative gate voltage is induced, or at least enhanced, by a polar phase transition in SrTiO3 which strongly reduces the lattice polarizability and the subsequent screening. In particular, we show that the charge localization and the polar order of SrTiO3 both develop below similar to 50 K and exhibit similar, unipolar hysteresis loops as a function of the gate voltage.
Related projects:

You are running an old browser version. We recommend updating your browser to its latest version.

More info