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Area of Science:

  • Condensed Matter Physics
  • Spintronics
  • Surface Science

Background:

  • The Rashba effect, crucial for spintronics, describes spin splitting in electron systems.
  • A proposed microscopic origin involves orbital angular momentum (OAM) in Bloch wave functions.

Purpose of the Study:

  • To provide experimental evidence for the OAM-based origin of the Rashba effect.
  • To investigate the relationship between OAM and spin splitting in AgTe/Ag(111).

Main Methods:

  • Angle-resolved photoemission spectroscopy (ARPES)
  • Two-photon photoemission spectroscopy
  • Quantitative low-energy electron diffraction (LEED)
  • First-principles calculations

Main Results:

  • Detailed structural parameters and stacking of the AgTe overlayer were determined with picometer precision.
  • ARPES and calculations unequivocally linked the presence/absence of Rashba spin splittings to OAM in different AgTe bands.
  • Experimental evidence supports the OAM-based origin of the Rashba effect.

Conclusions:

  • The study confirms the microscopic origin of the Rashba effect is tied to orbital angular momentum.
  • This finding advances the understanding of spin-orbit coupling in two-dimensional materials.
  • The results have implications for designing novel spintronic devices.