Electron Transfer and Ionic Displacements at the Origin of the 2D Electron Gas at the LAO/STO Interface: Direct Measurements with Atomic-Column Spatial Resolution

Electron Transfer and Ionic Displacements at the Origin of the 2D Electron Gas at the LAO/STO Interface: Direct Measurements with Atomic-Column Spatial Resolution

Using state‐of‐the‐art, aberration‐corrected scanning transmission electron microscopy and electron energy loss spectroscopy with atomic‐scale spatial resolution, experimental evidence for an intrinsic electronic reconstruction at the LAO/STO interface is shown. Simultaneous measurements of interfac...

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Veröffentlicht in:Advanced materials (Weinheim) 2012-08, Vol.24 (29), p.3952-3957
Hauptverfasser: Cantoni, Claudia, Gazquez, Jaume, Miletto Granozio, Fabio, Oxley, Mark P., Varela, Maria, Lupini, Andrew R., Pennycook, Stephen J., Aruta, Carmela, di Uccio, Umberto Scotti, Perna, Paolo, Maccariello, Davide
Format: Artikel
Sprache:eng
Schlagworte:
Aluminum Compounds - chemistry
ATOMIC DISPLACEMENTS
CATIONS
CHARGE DENSITY
charge transport
DIELECTRIC MATERIALS
ELECTRIC POTENTIAL
ELECTRON GAS
ELECTRON TRANSFER
Electron Transport
ELECTRONS
epitaxy
Gases - chemistry
Ions - chemistry
Lanthanum - chemistry
MATERIALS SCIENCE
Microscopy, Electron, Scanning Transmission
ORIGIN
oxide interfaces
Oxides - chemistry
OXYGEN
POLARIZATION
RELAXATION
SPATIAL RESOLUTION
Spectroscopy, Electron Energy-Loss
Strontium - chemistry
structure-property relationships
thin films
Titanium - chemistry
TRANSMISSION ELECTRON MICROSCOPY
VACANCIES
VALENCE
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Zusammenfassung:Using state‐of‐the‐art, aberration‐corrected scanning transmission electron microscopy and electron energy loss spectroscopy with atomic‐scale spatial resolution, experimental evidence for an intrinsic electronic reconstruction at the LAO/STO interface is shown. Simultaneous measurements of interfacial electron density and system polarization are crucial for establishing the highly debated origin of the 2D electron gas.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201200667