Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-11-11
Phys. Rev. Lett. 108 (2012) 117602
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.108.117602
We demonstrate the formation of a two-dimensional electron gas (2DEG) at the $(100)$ surface of the $5d$ transition-metal oxide KTaO$_3$. 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, our measurements provide a direct upper bound for potential Rashba spin splitting of only $\Delta{k}_\parallel\sim\0.02$ \AA$^{-1}$ at the Fermi level. The polar nature of the KTaO$_3(100)$ surface appears to help mediate formation of the 2DEG as compared to non-polar SrTiO$_3(100)$.
Bahramy Mohammad Saeed
Baumberger F.
Bell Christopher
Buaphet P.
Eknapakul T.
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