4.6 Article

Disentangling orbital and spin textures of surface-derived states in non-symmorphic semimetal HfSiS

Journal

PHYSICAL REVIEW B
Volume 100, Issue 20, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.205140

Keywords

-

Funding

  1. KAKENHI [17H06138, 17H06152, 18H03683]
  2. JSPS [19J00858, 18J22309]
  3. Croatian Science Foundation [IP-2018-01-8912]
  4. CeNIKS project - Croatian Government
  5. EU through the European Regional Development Fund - Competitiveness and Cohesion Operational Programme [KK.01.1.1.02.0013]
  6. Basque Departamento de Educacion, UPV/EHU [IT-756-13]
  7. Spanish Ministerio de Economia y Competitividad (MINECO Grant) [FIS2016-75862-P]
  8. Academic D. I. Mendeleev Fund Program of Tomsk State University [8.1.01.2018]
  9. Saint Petersburg State University [40990069]
  10. Russian Foundation for Basic Research - RFBR [18-52-06009]
  11. Ministry of Education and Science of the Russian Federation [3.8716.2017/P220 [3.8716.2017/9.10]]
  12. Fundamental Research Program of the State Academies of Sciences, line of research [III.23]
  13. Grants-in-Aid for Scientific Research [18J22309, 19J00858] Funding Source: KAKEN

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We have investigated the spin polarization and orbital configuration of the spin-split surface states in a nonsymmorphic semimetal HfSiS by spin- and angle-resolved photoelectron spectroscopy using polarized tunable photons combined with detailed theoretical calculations. We have found that the surface states surrounding the (X) over bar point with C-2v symmetry exhibit an exotic unidirectional spin texture coupled with d(yz) orbital. The observed unidirectional spin texture is well reproduced by the theoretical calculations. Our work clarifies the significance of orbital symmetry in the manipulation of spin orientations, providing an approach to realize the persistent spin texture for the prolonged spin-coherence time in spintronic applications.

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