Magnetism, spin texture, and in-gap states: Atomic specialization at the surface of oxygen-deficient SrTiO3

Michaela Altmeyer, Harald Olaf Jeschke, Oliver Hijano-Cubelos, Cyril Martins, Frank Lechermann, Klaus Koepernik, Andrés F. Santander-Syro, Marcelo J. Rozenberg, Roser Valentí, Marc Gabay

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Motivated by recent spin- and angular-resolved photoemission (SARPES) measurements of the two-dimensional electronic states confined near the (001) surface of oxygen-deficient SrTiO3, we explore their spin structure by means of ab initio density functional theory (DFT) calculations of slabs. Relativistic nonmagnetic DFT calculations display Rashba-like spin winding with a splitting of a few meV and when surface magnetism on the Ti ions is included, bands become spin-split with an energy difference ∼100 meV at the Γ point, consistent with SARPES findings. While magnetism tends to suppress the effects of the relativistic Rashba interaction, signatures of it are still clearly visible in terms of complex spin textures. Furthermore, we observe an atomic specialization phenomenon, namely, two types of electronic contributions: one is from Ti atoms neighboring the oxygen vacancies that acquire rather large magnetic moments and mostly create in-gap states; another comes from the partly polarized t2g itinerant electrons of Ti atoms lying further away from the oxygen vacancy, which form the two-dimensional electron system and are responsible for the Rashba spin winding and the spin splitting at the Fermi surface.

Original languageEnglish
Article number157203
JournalPhysical Review Letters
Volume116
Issue number15
DOIs
Publication statusPublished - Apr 14 2016
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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