%0 Journal Article %1 noauthororeditor %A Zwiebler, M. %A Di Gennaro, E. %A Hamann-Borrero, J. E. %A Ritschel, T. %A Green, R. J. %A Sawatzky, G. A. %A Schierle, E. %A Weschke, E. %A Leo, A. %A Miletto Granozio, F. %A Geck, J. %D 2020 %J Sci Rep %K a b %P 18359 %R 10.1038/s41598-020-74364-7 %T Transition from a uni- to a bimodal interfacial charge distribution in LaAlO$_3$/SrTiO$_3$ upon cooling %U https://www.nature.com/articles/s41598-020-74364-7#Ack1 %V 10 %X We present a combined resonant soft X-ray reflectivity and electric transport study of LaAlO3/SrTiO3 field effect devices. The depth profiles with atomic layer resolution that are obtained from the resonant reflectivity reveal a pronounced temperature dependence of the two-dimensional electron liquid at the LaAlO3/SrTiO3 interface. At room temperature the corresponding electrons are located close to the interface, extending down to 4 unit cells into the SrTiO3 substrate. Upon cooling, however, these interface electrons assume a bimodal depth distribution: They spread out deeper into the SrTiO3 and split into two distinct parts, namely one close to the interface with a thickness of about 4 unit cells and another centered around 9 unit cells from the interface. The results are consistent with theoretical predictions based on oxygen vacancies at the surface of the LaAlO3 film and support the notion of a complex interplay between structural and electronic degrees of freedom.

@article{noauthororeditor, abstract = {We present a combined resonant soft X-ray reflectivity and electric transport study of LaAlO3/SrTiO3 field effect devices. The depth profiles with atomic layer resolution that are obtained from the resonant reflectivity reveal a pronounced temperature dependence of the two-dimensional electron liquid at the LaAlO3/SrTiO3 interface. At room temperature the corresponding electrons are located close to the interface, extending down to 4 unit cells into the SrTiO3 substrate. Upon cooling, however, these interface electrons assume a bimodal depth distribution: They spread out deeper into the SrTiO3 and split into two distinct parts, namely one close to the interface with a thickness of about 4 unit cells and another centered around 9 unit cells from the interface. The results are consistent with theoretical predictions based on oxygen vacancies at the surface of the LaAlO3 film and support the notion of a complex interplay between structural and electronic degrees of freedom.}, added-at = {2022-05-10T15:58:35.000+0200}, author = {Zwiebler, M. and Di Gennaro, E. and Hamann-Borrero, J. E. and Ritschel, T. and Green, R. J. and Sawatzky, G. A. and Schierle, E. and Weschke, E. and Leo, A. and Miletto Granozio, F. and Geck, J.}, biburl = {https://www.bibsonomy.org/bibtex/23c61521c2b261c1d9c60ec02fe53b13e/ctqmat}, day = 27, description = {Transition from a uni- to a bimodal interfacial charge distribution in $$\hbox {LaAlO}_3$$ LaAlO 3 / $$\hbox {SrTiO}_3$$ SrTiO 3 upon cooling | Scientific Reports}, doi = {10.1038/s41598-020-74364-7}, interhash = {8d200855b71fd5ea537f130e06d6b3b6}, intrahash = {3c61521c2b261c1d9c60ec02fe53b13e}, journal = {Sci Rep}, keywords = {a b}, month = {10}, pages = 18359, timestamp = {2023-10-19T14:08:03.000+0200}, title = {Transition from a uni- to a bimodal interfacial charge distribution in LaAlO$_{\mathbf{3}}$/SrTiO$_{\mathbf{3}}$ upon cooling}, url = {https://www.nature.com/articles/s41598-020-74364-7#Ack1}, volume = 10, year = 2020 }