التفاصيل البيبلوغرافية
| العنوان: |
Transition from a uni- to a bimodal interfacial charge distribution in LaAlO3/SrTiO3 upon cooling. |
| المؤلفون: |
Zwiebler, M., Di Gennaro, E., Hamann-Borrero, J. E., Ritschel, T., Green, R. J., Sawatzky, G. A., Schierle, E., Weschke, E., Leo, A., Granozio, F. Miletto, Geck, J. |
| المصدر: |
Scientific Reports; 10/27/2020, Vol. 10 Issue 1, pN.PAG-N.PAG, 1p |
| مصطلحات موضوعية: |
X-rays, ATOMIC layer deposition, COOLING, TITANIUM oxides, ELECTRONS |
| مستخلص: |
We present a combined resonant soft X-ray reflectivity and electric transport study of LaAlO 3 / SrTiO 3 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 LaAlO 3 / SrTiO 3 interface. At room temperature the corresponding electrons are located close to the interface, extending down to 4 unit cells into the SrTiO 3 substrate. Upon cooling, however, these interface electrons assume a bimodal depth distribution: They spread out deeper into the SrTiO 3 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 LaAlO 3 film and support the notion of a complex interplay between structural and electronic degrees of freedom. [ABSTRACT FROM AUTHOR] |
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