Rössle, Matthias Kim, Kyung Wan Dubroka, Adam Marsik, Premysl Wang, Chen Nan Jany, R. Richter, C. Mannhart, J. Schneider, C. W. Frano, A. Wochner, P. Lu, Y. Keimer, B. Shukla, D. K. Strempfer, J. Bernhard, Christian 2013-03-27 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 ∼50  K and exhibit similar, unipolar hysteresis loops as a function of the gate voltage. application/pdf https://folia.unifr.ch/global/documents/302944 https://folia.unifr.ch/documents/302944/files/ber_efi.pdf https://folia.unifr.ch/documents/302944/files/ber_efi_sm.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevLett.110.136805 info:eu-repo/semantics/openAccess License undefined Physical Review Letters. - 2013, vol. 110, no. 13, p. 136805 info:eu-repo/classification/udc/57 Electric-Field-Induced Polar Order and Localization of the Confined Electrons in LaAlO₃/SrTiO₃ Heterostructures http://purl.org/coar/resource_type/c_6501