Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO3 |
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Authors: | King P D C He R H Eknapakul T Buaphet P Mo S-K Kaneko Y Harashima S Hikita Y Bahramy M S Bell C Hussain Z Tokura Y Shen Z-X Hwang H Y Baumberger F Meevasana W |
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Affiliation: | SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife, United Kingdom. |
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Abstract: | We demonstrate the formation of a two-dimensional electron gas (2DEG) at the (100) surface of the 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, our measurements provide a direct upper bound for the potential Rashba spin splitting of only Δk(parallel)}~0.02 ?(-1) at the Fermi level. The polar nature of the KTaO3(100) surface appears to help mediate the formation of the 2DEG as compared to nonpolar SrTiO3(100). |
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