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

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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:	CEITEC - Central European Institute of Technology