Electron Transport at the TiO₂ Surfaces of Rutile, Anatase, and Strontium Titanate: The Influence of Orbital Corrugation.
The two-dimensional electron gas in SrTiO3 created by an overlayer of amorphous LaAlO3 is compared with those at the TiO2-terminated surfaces of rutile and anatase. Differences in conductivity are explained in terms of the limiting Ti-O-Ti bond angles (orbital corrugation), band dispersion, and polaron formation. At 300 K, the sheet conductivity and mobility of anatase exceed those for SrTiO3 or rutile by one or two orders of magnitude, respectively. The electrons in rutile become localized below 25 K.
Department of Physics, National University of Singapore , Singapore 117542.|NUSNNI-NanoCore, National University of Singapore , Singapore 117576.
Tarapada
T
Sarkar
NUSNNI-NanoCore, National University of Singapore , Singapore 117576.
Kalon
K
Gopinadhan
Department of Physics, National University of Singapore , Singapore 117542.
Jun
J
Zhou
NUSNNI-NanoCore, National University of Singapore , Singapore 117576.
Surajit
S
Saha
School of Physics and CRANN, Trinity College , Dublin 2, Ireland.
J M D
JM
Coey
Department of Physics, National University of Singapore , Singapore 117542.
Yuan Ping
YP
Feng
Department of Physics, National University of Singapore , Singapore 117542.|NUSNNI-NanoCore, National University of Singapore , Singapore 117576.
Ariando
Department of Physics, National University of Singapore , Singapore 117542.|NUSNNI-NanoCore, National University of Singapore , Singapore 117576.|Department of Electrical and Computer Engineering, National University of Singapore , Singapore 117576.|Department of Materials Science and Engineering, National University of Singapore , Singapore 119077.
T
T
Venkatesan
anatase; anisotropic conductivity; bond angles; mobility; rutile; strontium titanate; two-dimensional electron gas