 DOCUMENT METADATASLAC Publication: SLAC-PUB-14625
SLAC Release Date: March 1, 2012
Subband Structure of a Two-Dimensional Electron Gas Formed at the Polar Surface of the Strong Spin-Orbit Perovskite KTaO3
King, P.D.C..
We demonstrate the formation of a two-dimensional electron gas (2DEG) at the (100) surface of he 5d transition-metal oxide KTaO3. From angle-resolved photoemission, we find that quantum confinement lifts the orbital degeneracy of the bulk band structure and leads to a 2DEG composed
of ladders of subband states of both light and heavy carriers. Despite the strong spin-orbit coupling, We find no experimental signatures of a Rashba spin splitting, which has important implications for the interpreta... Show Full Abstract
We demonstrate the formation of a two-dimensional electron gas (2DEG) at the (100) surface of he 5d transition-metal oxide KTaO3. From angle-resolved photoemission, we find that quantum confinement lifts the orbital degeneracy of the bulk band structure and leads to a 2DEG composed
of ladders of subband states of both light and heavy carriers. Despite the strong spin-orbit coupling, We find no experimental signatures of a Rashba spin splitting, which has important implications for the interpretation of transport measurements in both KTaO3- and SrTiO3-based 2DEGs. The polar
nature of the KTaO3(100) surface appears to help mediate formation of the 2DEG as compared to
non-polar SrTiO3(100). Show Partial Abstract
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