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 interfacial electron density and system polarization are crucial for establishing the highly debated origin of the 2D electron gas.
Materials Science and Technology Division, Oak Ridge National Laboratory, TN 37831-6116, USA. cantonic@ornl.gov
Claudia
C
Cantoni
Jaume
J
Gazquez
Fabio
F
Miletto Granozio
Mark P
MP
Oxley
Maria
M
Varela
Andrew R
AR
Lupini
Stephen J
SJ
Pennycook
Carmela
C
Aruta
Umberto Scotti
US
di Uccio
Paolo
P
Perna
Davide
D
Maccariello
D017607:Aluminum Compounds / Q000737:chemistry*; D004579:Electron Transport; D004583:Electrons; D005740:Gases / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D007811:Lanthanum / Q000737:chemistry*; D017348:Microscopy, Electron, Scanning Transmission; D010087:Oxides / Q000737:chemistry*; D046590:Spectroscopy, Electron Energy-Loss; D013324:Strontium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D017607:Aluminum Compounds; D005740:Gases; D007477:Ions; D010087:Oxides; D007811:Lanthanum; D014025:Titanium; C119252:strontium titanium oxide; D013324:Strontium