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Influence of atomic termination on the LaAlO3/SrTiO3 interfacial polar rearrangement

Rubano, A.
Günter, T.
Fink, T.
Paparo, D.
Marrucci, L.
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Published in Physical Review. B, Condensed Matter. 2013, vol. 88, no. 3, p. 035405
Abstract We report the results of second-harmonic optical spectroscopy of LaAlO3 films grown on SrTiO3 (001) substrates having either TiO2 or SrO atomic terminations. The atomic termination is found to have a large effect on the observed spectra, with a strong dependence on the ω-2ω light polarizations. These results are analyzed through a model based on symmetry-controlled selection rules and atomic orbital overlaps. The analysis shows that, as suspected from transport measurements, the SrO termination prevents the formation of a mobile interfacial electron gas. Yet, by explicitly probing and identifying the electronic states at the O2−–Ti3+ band gap we now obtain unique and direct evidence that this is caused by the absence of any detectable charge injection in the interfacial region rather than by carrier localization.
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Research group Groupe Triscone
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RUBANO, A. et al. Influence of atomic termination on the LaAlO3/SrTiO3 interfacial polar rearrangement. In: Physical Review. B, Condensed Matter, 2013, vol. 88, n° 3, p. 035405. https://archive-ouverte.unige.ch/unige:47225

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Deposited on : 2015-02-24

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