Savoia, Annunziata and Ristic, Zoran and Scotti Di Uccio, Umberto and Marrucci, Lorenzo (2009) Polar catastrophe and electronic reconstructions at the LaAlO3/SrTiO3 interface: evidence from optical second harmonic generation. [Pubblicazione in rivista scientifica]

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Tipologia del documento:	Pubblicazione in rivista scientifica
Lingua:	English
Titolo:	Polar catastrophe and electronic reconstructions at the LaAlO3/SrTiO3 interface: evidence from optical second harmonic generation
Autori:	Autore Email Savoia, Annunziata [non definito] Ristic, Zoran [non definito] Scotti Di Uccio, Umberto [non definito] Marrucci, Lorenzo [non definito]
Autore/i:	A. Savoia, D. Paparo, P. Perna, Z. Ristic, M. Salluzzo, F. Miletto Granozio, U. Scotti di Uccio, C. Richter, S. Thiel, J. Mannhart, L. Marrucci
Data:	2009
Numero di pagine:	6
Dipartimento:	Scienze fisiche
Numero identificativo:	10.1103/PhysRevB.80.075110
Titolo del periodico:	PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Data:	2009
Volume:	80
Intervallo di pagine:	075110-1-075110-6
Numero di pagine:	6
Parole chiave:	Oxides, second harmonic generation, interface
Numero identificativo:	10.1103/PhysRevB.80.075110
Depositato il:	21 Ott 2010 06:57
Ultima modifica:	30 Apr 2014 19:43
URI:	http://www.fedoa.unina.it/id/eprint/7589

Abstract

The so-called “polar catastrophe,” a sudden electronic reconstruction taking place to compensate for the interfacial ionic polar discontinuity, is currently considered as a likely factor to explain the surprising conductivity of the interface between the insulators LaAlO3 and SrTiO3. We applied optical second harmonic generation, a technique that a priori can detect both mobile and localized interfacial electrons, to investigating the electronic polar reconstructions taking place at the interface. As the LaAlO3 film thickness is increased, we identify two abrupt electronic rearrangements: the first takes place at a thickness of unit cells, in the insulating state; the second occurs at a thickness of 4–6 unit cells, i.e., just above the threshold for which the samples become conducting. Two possible physical scenarios behind these observations are proposed. The first is based on an electronic transfer into localized electronic states at the interface that acts as a precursor of the conductivity onset. In the second scenario, the signal variations are attributed to the strong ionic relaxations taking place in the LaAlO3 layer.

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