UNIGE document Scientific Article
previous document  unige:42077  next document
add to browser collection
Title

Subband Structure of a Two-Dimensional Electron Gas Formed at the Polar Surface of the Strong Spin-Orbit Perovskite KTaO3

Authors
King, P. D. C.
He, R. H.
Eknapakul, T.
Buaphet, P.
Mo, S.-K.
Kaneko, Y.
Harashima, S.
Hikita, Y.
show hidden authors show all authors [1 - 16]
Published in Physical Review Letters. 2012, vol. 108, no. 11, p. 117602
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∥∼0.02  Å−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).
Identifiers
Full text
Structures
Citation
(ISO format)
KING, P. D. C. et al. Subband Structure of a Two-Dimensional Electron Gas Formed at the Polar Surface of the Strong Spin-Orbit Perovskite KTaO3. In: Physical Review Letters, 2012, vol. 108, n° 11, p. 117602. https://archive-ouverte.unige.ch/unige:42077

196 hits

306 downloads

Update

Deposited on : 2014-11-21

Export document
Format :
Citation style :