Manipulating quantum-well states by surface alloying: Pb on ultrathin Ag films

Hirahara, Toru; Komorida, Taku; Sato, Akira; Bihlmayer, Gustav; Chulkov, Eugene V.; He, Ke; Matsuda, Iwao; Hasegawa, Shuji

doi:10.1103/physrevb.78.035408

Cited by 15 publications

(10 citation statements)

References 42 publications

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“…1 The data on the Sb alloys, where bands A and B have more similar intensities with respect to their Bi counterparts, allow the saddle point to be assigned to the p x p y states, rather than to the sp z band, as suggested elsewhere. 4,23 Free-electronlike bands associated with Cu ͑Ag͒ bulk 4s͑5s͒ states, dispersing in the second BZ, together with fainter replicas in the first BZ, are observed in all four ARPES maps. An analysis of Fig.…”

Section: Resultsmentioning

confidence: 84%

Influence of the substrate on the spin-orbit splitting in surface alloys on (111) noble-metal surfaces

et al. 2009

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We have studied by angle-resolved photoelectron spectroscopy the ordered XCu 2 surface alloys formed by X = Sb and Bi on a Cu͑111͒ substrate. We found clear analogies with the corresponding XAg 2 alloys formed by the same elements on Ag͑111͒. The electronic states near the Fermi level are similarly split by the spin-orbit ͑SO͒ interaction with the smaller splitting in XCu 2 reflecting the smaller atomic SO parameter of Cu vs Ag. The charge transfer from the Bi and Sb adatoms to the substrate atoms and their outward relaxation are different for two substrates; both determine the Fermi energy of the two-dimensional electron gas.

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Section: Resultsmentioning

confidence: 84%

Influence of the substrate on the spin-orbit splitting in surface alloys on (111) noble-metal surfaces

et al. 2009

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“…The size of the spin-splitting for the Pb/Ag(111) surface alloy is still under debate due to different interpretations of the measured ARPES spectra [6,[30][31][32]. Depending on the band dispersion of the sp z -band and the p xy -band in the unoccupied states, the occupied states may be assigned to different bands [6,18].…”

Section: Bi/ag(111)mentioning

confidence: 99%

Structural influence on the Rashba-type spin splitting in surface alloys

et al. 2010

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The Bi/Ag(111), Pb/Ag(111), and Sb/Ag(111) surface alloys exhibit a two-dimensional band structure with a strongly enhanced Rashba-type spin splitting, which is in part attributed to the structural asymmetry resulting from an outward relaxation of the alloy atoms. In order to gain further insight into the spin splitting mechanism, we have experimentally determined the outward relaxation of the alloy atoms in these surface alloys using quantitative low-energy electron diffraction. The structure plays an important role in the size of the spin splitting as it dictates the potential landscape, the symmetry as well as the orbital character. Furthermore, we discuss the band ordering of the Pb/Ag (111) The Bi/Ag(111), Pb/Ag(111), and Sb/Ag(111) surface alloys exhibit a two-dimensional band structure with a strongly enhanced Rashba-type spin-splitting, which is in part attributed to the structural asymmetry resulting from an outward relaxation of the alloy atoms. In order to gain further insight into the spin-splitting mechanism, we have experimentally determined the outward relaxation of the alloy atoms in these surface alloys using quantitative low-energy electron diffraction (LEED). The structure plays an important role in the size of the spinsplitting as it dictates the potential landscape, the symmetry as well as the orbital character. Furthermore, we discuss the band ordering of the Pb/Ag(111) surface alloy as well as the reproducible formation of Sb/Ag(111) surface alloys with unfaulted (face-centered cubic) and faulted (hexagonally close-packed) toplayer stacking.

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“…Indeed, DFT calculations predict two spin-split states above the Fermi level [7]. As a result the bands relevant for the surface Rashba effect are mostly unoccupied and thereby largely unaccessible by ARPES [4,5,9,20].…”

Section: Introductionmentioning

confidence: 99%

A combined experimental and theoretical study of Rashba-split surface states on the $(\sqrt{3}\times \sqrt{3})$ Pb/Ag(111)$R30{}^\circ $ surface

et al. 2014

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We report on a combined low-temperature scanning tunneling spectroscopy (STS), angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) investigation of the × ( 3 3)R30°Pb/Ag(111) surface alloy which provides a giant Rashba-type spin splitting. With STS we observed spectroscopic features that are assigned to two hole-like Rashba-split bands in the unoccupied energy range. By means of STS and quantum interference mapping we determine the band onsets, splitting strengths, and dispersions for both bands. The unambiguous assignment of scattering vectors is achieved by comparison to ARPES measurements. While intra-band scattering is found for both Rashba bands, inter-band scattering is only observed in the occupied energy range. Spin-and orbitally-resolved band structures were obtained by DFT calculations. Considering the scattering between states of different spin-and orbital character, the apparent deviation between Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. experimentally observed scattering events and the theoretically predicted spin polarization could be resolved.Keywords: Rashba effect, spin-orbit coupling, scanning tunneling microscopy, angle resolved photo emission spectroscopy, density functional theory New J. Phys. 16 (2014) 045017 L El-Kareh et al 2 New J. Phys. 16 (2014) 045017 L El-Kareh et al

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Manipulating quantum-well states by surface alloying: Pb on ultrathin Ag films

Cited by 15 publications

References 42 publications

Influence of the substrate on the spin-orbit splitting in surface alloys on (111) noble-metal surfaces

Influence of the substrate on the spin-orbit splitting in surface alloys on (111) noble-metal surfaces

Structural influence on the Rashba-type spin splitting in surface alloys

A combined experimental and theoretical study of Rashba-split surface states on the $(\sqrt{3}\times \sqrt{3})$ Pb/Ag(111)$R30{}^\circ $ surface

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