Hierarchical spin-orbital polarisation of a giant Rashba system

Lewis Bawden, Jonathon Mark Riley, C. H. Kim, R. Sankar, E.J. Monkman, D.E. Shai, H.I. Wei, E. Lochocki, J.W. Wells, W. Meevasana, T.K. Kim, M. Hoesch, Y. Ohtsubo, P. Le Fevre, C.J. Fennie, K.M. Shen, F.C. Chou, Phil King

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

The Rashba effect is one of the most striking manifestations of spin-orbit coupling in solids and provides a cornerstone for the burgeoning field of semiconductor spintronics. It is typically assumed to manifest as a
momentum-dependent splitting of a single initially spin-degenerate band into two branches with opposite spin polarization. Combining polarization-dependent and resonant angle-resolved photoemission measurements
with density functional theory calculations, we show that the two “spin-split” branches of the model giant Rashba system BiTeI additionally develop disparate orbital textures, each of which is coupled to a distinct spin configuration. This necessitates a reinterpretation of spin splitting in Rashba-like systems and opens new possibilities for controlling spin polarization through the orbital sector.
Original languageEnglish
Article numbere1500495
JournalScience Advances
Volume1
Issue number8
DOIs
Publication statusPublished - 25 Sept 2015

Keywords

  • Spintronics
  • Rashba
  • BiTel
  • Spin-orbit coupling
  • Angle-resolved photoemission
  • Electronic structure
  • Orbital texture

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