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Hierarchical spin-orbital polarization of a giant Rashba system

DOI: 10.1126/sciadv.1500495 DOI Help
PMID: 26601268 PMID Help

Authors: Lewis Bawden (University of St Andrews, U.K.) , Jonathon Riley (University of St Andrews, U.K.) , C. H. Kim (Cornell University) , R. Sankar (National Taiwan University) , E. J. Monkman (Cornell University) , D. E. Shai (Cornell University) , H. I. Wei (Cornell University) , E. B. Lochocki (Cornell University) , J. W. Wells (NTNU) , W. Meevasana (Suranaree University of Technology) , Timur Kim (Diamond Light Source) , M Hoesch (Diamond Light Source) , Y. Ohtsubo (Synchrotron SOLEIL) , P. Le Fevre (Synchrotron SOLEIL) , C. J. Fennie (Cornell University) , K. M. Shen (Cornell University) , F. Chou (National Taiwan University) , P. D. C. King (University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Science Advances , VOL 1 (8) , PAGES 1500495

State: Published (Approved)
Published: September 2015
Diamond Proposal Number(s): 9427

Open Access Open Access

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 polarisation. Here, combining polarisation-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 re-interpretation of spin splitting in Rashba-like systems, and opens new possibilities for controlling spin polarisation through the orbital sector.

Subject Areas: Physics, Materials

Instruments: I05-ARPES

Other Facilities: SOLEIL

Added On: 27/09/2015 10:44

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