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Orbital symmetry reconstruction and strong mass renormalization in the two-dimensional electron gas at the surface of KTaO3

A. F. Santander-Syro 1 C. Bareille 1 F. Fortuna 2 O. Copie M. Gabay 3 F. Bertran 4 A. Taleb-Ibrahimi 4 P. Le Fevre 4 P. Herranz N. Reyren 5 M. Bibes 5 A. Barthelemy 5 P. Lecoeur 6 J. Guevara M. J. Rozenberg 3
1 CSNSM PS2
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière
2 CSNSM INSTR
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Abstract : We study, using angle-resolved photoemission spectroscopy, the two-dimensional electron gas (2DEG) at the surface of KTaO3 (KTO), a wide-gap insulator with strong spin-orbit coupling (SOC). We find that this 2DEG is a genuinely different physical state with respect to the bulk: the orbital symmetries of its subbands are entirely reconstructed and their masses are renormalized. This occurs because the values of the SOC, the Fermi energy, and the subband splittings become comparable in the 2DEG. Additionally, we identify an F-center-like heavy band resulting from the polar nature of the KTO surface.
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Submitted on : Tuesday, October 16, 2012 - 2:48:41 PM
Last modification on : Wednesday, September 16, 2020 - 5:43:39 PM

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A. F. Santander-Syro, C. Bareille, F. Fortuna, O. Copie, M. Gabay, et al.. Orbital symmetry reconstruction and strong mass renormalization in the two-dimensional electron gas at the surface of KTaO3. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2012, 86, pp.121107. ⟨10.1103/PhysRevB.86.121107⟩. ⟨in2p3-00742469⟩

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