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| Reference : Spontaneous 2-Dimensional Carrier Confinement at the n-Type SrTiO3=LaAlO3 Interface |
| Scientific journals : Article | |||
| Physical, chemical, mathematical & earth Sciences : Physics | |||
| http://hdl.handle.net/2268/92965 | |||
| Spontaneous 2-Dimensional Carrier Confinement at the n-Type SrTiO3=LaAlO3 Interface | |
| English | |
| Delugas, P. [ > > ] | |
| Filippetti, A. [ > > ] | |
| Fiorentini, V. [ > > ] | |
Bilc, Daniel  [Université de Liège - ULg > Département de physique > Physique théorique des matériaux >] | |
| Fontaine, Denis [Université de Liège - ULg > Département de physique > Physique théorique des matériaux >] | |
| Ghosez, Philippe [Université de Liège - ULg > Département de physique > Physique théorique des matériaux >] | |
| Apr-2011 | |
| Physical Review Letters | |
| American Physical Society | |
| 106 | |
| International | |
| 0031-9007 | |
| 1079-7114 | |
| Ridge | |
| NY | |
| [en] We describe the intrinsic mechanism of 2-dimensional electron confinement at the n-type
SrTiO3=LaAlO3 interface as a function of the sheet carrier density ns via advanced first-principles calculations. Electrons localize spontaneously in Ti 3dxy levels within a thin (& 2 nm) interface-adjacent SrTiO3 region for ns lower than a threshold value nc 1014 cm 2. For ns >nc a portion of charge flows into Ti 3dxz-dyz levels extending farther from the interface. This intrinsic confinement can be attributed to the interface-induced symmetry breaking and localized nature of Ti 3d t2g states. The sheet carrier density directly controls the binding energy and the spatial extension of the conductive region. A direct, quantitative relation of these quantities with ns is provided. | |
| Researchers ; Professionals ; Students | |
| http://hdl.handle.net/2268/92965 | |
| 10.1103/PhysRevLett.106.166807 |
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