Assessing the atomic contribution to the Rashba spin-orbit splitting in surface alloys: Sb/Ag(111)

Moreschini, Luca; Bendounan, Azzedine; Gierz, Isabella; Ast, Christian R.; Mirhosseini, Hossein; Höchst, H.; Kern, Klaus; Henk, J.; Ernst, A.; Ostanin, S.; Reinert, F.; Grioni, M.

doi:10.1103/physrevb.79.075424

Cited by 66 publications

(67 citation statements)

References 30 publications

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“…Furthermore, the spin signal along the x-direction is clearly symmetric with respect toΓ. These unexpected P x and P z signals closely resemble observations for the Sb induced surface reconstruction on Ag(111) [33], where it was found that spin-interference in the photoemission process can induce a spin signal perpendicular to the direction expected for a Rashba signal [34]. This effect is part of a wide range of photoemission processes that can induce a spin signal many of which are well understood and others which remain unclear at the moment [35].…”

supporting

confidence: 81%

Rashba-type spin splitting and spin interference of the Cu(1 1 1) surface state at room temperature

Dil

Meier

Osterwalder

2015

Journal of Electron Spectroscopy and Related Phenomena

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We report on the measurement of the Rashba-type spin splitting of the Shockley surface state on Cu(111) by spin-and angle-resolved photoemission at room temperature. Along the spatial direction expected for a Rashba-type effect the measured spin splitting corresponds to what has previously been reported by first principle calculations which were verified by high resolution ARPES using low temperatures and perfect crystals. Furthermore it is found that structural defects cause a spin-interference in the photoemission process and as a result the main measured spin signal is in the plane orthogonal to the typical Rashba orientation. Although the determination of the exact origin of this signal requires further investigations, the main results can be used as a bench mark for future spin-resolved photoemission set-ups.

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supporting

confidence: 81%

Rashba-type spin splitting and spin interference of the Cu(1 1 1) surface state at room temperature

Dil

Meier

Osterwalder

2015

Journal of Electron Spectroscopy and Related Phenomena

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“…However, as reported in that study, the Ge/Ag surface alloy shows an unexpected surface band split at theM points along the¯ KM line of the Ý3 × Ý3 surface Brillouin zone (SBZ). The observation of split bands at theM points clearly indicates that the Ge/Ag alloy differs substantially from the other group IV alloys (Pb/Ag [11] and Sn/Ag [3]; as well as from the alloys induced by Bi [2] or Sb [12]). As was concluded in Ref.…”

Section: Introductionmentioning

confidence: 92%

Broken symmetry induced band splitting in theAg2Gesurface alloy on Ag(111)

et al. 2014

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We report a study of the atomic and electronic structures of the ordered Ag 2 Ge surface alloy containing ⅓ monolayer of Ge. Low-energy electron diffraction (LEED), scanning tunneling microscopy (STM), and angle-resolved photoelectron spectroscopy (ARPES) data reveal a symmetry breaking of the expected Ý3 × Ý3 periodicity, which is established for other Ag 2 M alloys (M = Bi, Sb, Pb, and Sn). The deviation from a simple Ý3 × Ý3 structure manifests itself as a splitting of diffraction spots in LEED, as a striped structure with a 6× periodicity including a distortion of the local hexagonal structure in STM, and as a complex surface band structure in ARPES that is quite different from those of the other Ag 2 M alloys. These results are interesting in view of the differences in the atomic and electronic structures exhibited by different group IV elements interacting with Ag(111). Pb and Sn form Ý3 × Ý3 surface alloys on Ag(111), of which Ag 2 Pb shows a surface band structure with a clear spin-orbit split. Si and C form silicene and graphene structures, respectively, with linear band dispersions and the formation of Dirac cones as reported for graphene. The finding that Ag 2 Ge deviates from the ideal (Ý3 × Ý3) Ag 2 Sn and Ag 2 Pb surface alloys makes Ge an interesting "link" between the heavy group IV elements (Sn, Pb) and the light group IV elements (Si, C).

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“…Decorating the surfaces with different atoms/adlayers modifies the Rashba-type spin splitting in the states at the surface, e. g. (Ar, Kr, Xe) on Au(111) [13,14], Li on (W(110), Mo(110)) [10], (Au, Ag) layers on (W(110), Mo(110)) [15]. The biggest increase of the spin splitting up to now was achieved by surface alloying, where every third atom in a noble metal (111) surface (Ag(111) [16][17][18][19][20][21][22] or Cu(111) [20,23]) is replaced by a heavy alloy atom (Bi, Pb and Sb). These surface alloys exhibit a spin splitting that is orders of magnitude larger than, e. g. in semiconductor heterostructures [17].…”

Section: Introductionmentioning

confidence: 99%

Tuning the spin texture in binary and ternary surface alloys on Ag(111)

et al. 2011

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Recently, a giant spin splitting has been observed in surface alloys on noble metal (111) surfaces as a result of a strong structural modification at the surface as well as the large atomic spin-orbit interaction (SOI) of the alloy atoms. These surface alloys are an ideal playground to manipulate both the size of the spin splitting as well as the position of the Fermi level as it is possible to change the atomic SOI as well as the relaxation by varying alloy atoms and substrates. Using spin-and angle-resolved photoemission spectroscopy in combination with quantitative low energy electron diffraction we have studied the mixed binary BixSb1−x/Ag(111) and the mixed ternary BixPbySb1−x−y/Ag(111) surface alloys where we observed a continuous evolution of the band structure with x and y.

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Assessing the atomic contribution to the Rashba spin-orbit splitting in surface alloys: Sb/Ag(111)

Cited by 66 publications

References 30 publications

Rashba-type spin splitting and spin interference of the Cu(1 1 1) surface state at room temperature

Rashba-type spin splitting and spin interference of the Cu(1 1 1) surface state at room temperature

Broken symmetry induced band splitting in theAg2Gesurface alloy on Ag(111)

Tuning the spin texture in binary and ternary surface alloys on Ag(111)

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