[en] The formation of a two-dimensional electron gas at oxide interfaces as a consequence of polar discontinuities has generated an enormous amount of activity due to the variety of interesting effects it gives rise to. Here, we studyunderwhatcircumstancessimilarprocessescanalsotakeplaceunderneathferroelectricthinfilms.Weusea simpleLandaumodeltodemonstratethatintheabsenceofextrinsicscreeningmechanisms,amonodomainphase can be stabilized in ferroelectric films by means of an electronic reconstruction. Unlike in the LaAlO3/SrTiO3 heterostructure, the emergence with thickness of the free charge at the interface is discontinuous. This prediction is confirmed by performing first-principles simulations of free-standing slabs of PbTiO3. The model is also used to predict the response of the system to an applied electric field, demonstrating that the two-dimensional electron gas can be switched on and off discontinuously and in a nonvolatile fashion. Furthermore, the reversal of the polarization can be used to switch between a two-dimensional electron gas and a two-dimensional hole gas, which should, in principle, have very different transport properties. We discuss the possible formation of polarization domains and how such configuration competes with the spontaneous accumulation of free charge at the interfaces.
Disciplines :
Physics
Author, co-author :
Aguado-Puente, P.
Bristowe, Nicholas ; Université de Liège > Département de physique > Physique théorique des matériaux
Yin, B.
Shirasawa, R.
Ghosez, Philippe ; Université de Liège > Département de physique > Physique théorique des matériaux
Littlewood, P.
Artacho
Language :
English
Title :
Model of two-dimensional electron gas formation at ferroelectric interfaces
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