The Shockley-type surface state on Ar covered Au(111): High resolution photoemission results and the description by slab-layer DFT calculations

Förster, Frank; Bendounan, Azzedine; Reinert, F.; Grigoryan, Valeri G.; Springborg, Michael

doi:10.1016/j.susc.2007.09.054

Cited by 32 publications

(30 citation statements)

References 75 publications

(115 reference statements)

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“…Also, numerous investigations have been devoted to its modification upon deposition of metallic layers, [37][38][39][40] adsorption of different gases, [41][42][43][44] or even evaporation of well-ordered layers of organic molecules on the surface. 45 It has often been discussed that two parameters influence the size of the band splitting: the atomic SO interaction and the gradients of the surface potential directed perpendicular and parallel to the surface.…”

Section: Resultsmentioning

confidence: 99%

Evolution of the Rashba spin-orbit-split Shockley state on Ag/Pt(111)

et al. 2011

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We have studied the evolution of the Pt(111) Shockley-type surface state, which can be described as a surface resonance upon deposition of Ag monolayers. We have combined angle-resolved photoemission and scanning-tunneling-spectroscopy measurements with electronic-structure and photoemission calculations for true semi-infinite systems to guarantee a complete description of all surface-sensitive spectral features. An unusual energy shift and a considerable Rashba-type spin-orbit splitting of the surface resonance were observed and are discussed in terms of modifications in the electronic structure and relationship between the semi-infinite bulk and the surface potential via multiple electron scattering. The maximum magnitude of the splitting in momentum space amounts to 0.051 ± 0.007Å−1 and appears as one of the highest values so far observed in thē -type surface-state-resonance bands.

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Section: Resultsmentioning

confidence: 99%

Evolution of the Rashba spin-orbit-split Shockley state on Ag/Pt(111)

et al. 2011

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“…The dispersion of the L-gap surface states on Au(111) can be accurately fit by the above parabolic function with m * = 0.255 m e and α R = 6.0 × 10 −11 eV m 26,30,31 . Density functional theory (DFT) calculations in the local density approximation (LDA) reproduce the observed parabolic dispersion and spin splitting on Au(111) up to a rigid overall enarXiv:1411.5971v1 [cond-mat.mtrl-sci] 21 Nov 2014 ergy shift 31,32 , while the calculated splitting on Ag(111) was too small to be resolved in experiment 31 . The chiral spin polarization of the surface states on Au(111) [33][34][35] 57 surface states in 24-layer Au(111) and Ag(111) films.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit interaction and Dirac cones ind-orbital noble metal surface states

et al. 2015

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Band splittings, chiral spin polarization and topological surface states generated by spin-orbit interactions at crystal surfaces are receiving a lot of attention for their potential device applications as well as fascinating physical properties. Most studies have focused on sp states near the Fermi energy, which are relevant for transport and have long lifetimes. Far less explored, though in principle stronger, are spin-orbit interaction effects within d states, including those deep below the Fermi energy. Here, we report a joint photoemission/ab initio study of spin-orbit effects in the deep d orbital surface states of a 24-layer Au film grown on Ag(111) and a 24-layer Ag film grown on Au(111), singling out a conical intersection (Dirac cone) between two surface states in a large surface-projected gap at the time-reversal symmetric M points. Unlike the often isotropic dispersion at Γ point Dirac cones, the M point cones are strongly anisotropic. An effective k · p Hamiltonian is derived to describe the anisotropic band splitting and spin polarization near the Dirac cone.

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“…Such effects are commonly analyzed by photoemission, either by probing core-level states or by measuring the evolution of the valence band, including the behavior of the surface state. 12 The latter is strongly sensitive to different types of adsorbates [13][14][15][16] and can even track the formation of, e.g., faulted stacking at the interface, which results in general from a relaxation of strains in the system through a creation of dislocation loops. 17 In this contest, we have recently found a partially occupied Shockley-type surface resonance on a Ag/Pt(111) system with a binding energy and a RSO splitting amplitude, both depending on the thickness of the Ag layer.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the formation of interface-confined mixture by photoelectron spectroscopy

et al. 2012

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We have investigated valence-band properties of Pt(111) surface covered by an Ag layer. Aside from showing significant changes in the d bands and the sp-like Shockley-type surface resonance depending on the thickness of the Ag layer, our spectroscopic data suggest the formation of an Ag-Pt mixture that progressively develops at the interface upon increasing the annealing temperature of the sample. On a 2-ML system, the Shockley resonance band is partially occupied and exhibits a large Rashba spin-orbit splitting that can be described by a first-principles band-structure calculation based on multiple-scattering theory. For the interface alloy, we have used the coherent potential approximation, which is one of the best models among the so-called single-site (local) theory. We observe a shift of the Shockley resonance due to the alloying process at the interface that probably favors the formation of the well-known triangular reconstruction.

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The Shockley-type surface state on Ar covered Au(111): High resolution photoemission results and the description by slab-layer DFT calculations

Cited by 32 publications

References 75 publications

Evolution of the Rashba spin-orbit-split Shockley state on Ag/Pt(111)

Evolution of the Rashba spin-orbit-split Shockley state on Ag/Pt(111)

Spin-orbit interaction and Dirac cones ind-orbital noble metal surface states

Monitoring the formation of interface-confined mixture by photoelectron spectroscopy

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