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

Abstract

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.

Ag-coverage-dependent symmetry of the electronic states of the Pt(111)-Ag-Bi interface: The ARPES view of a structural transition

“…As discussed in Sec. III, our results on the Bifree interface are in good agreement with Bendounan et al 21 Figure 2 evidences the unoccupied surface state of Pt(111), 17 which shifts below E F after Ag deposition of 2-3 MLs and presents an enhanced RB splitting. The latter was attributed to multiple scattering between bulk and surface.…”

“…The latter was attributed to multiple scattering between bulk and surface. 21 Our results suggest that there is still no alloying after the deposition of Bi. Therefore it is multiple scattering between bulk and surface, rather than a strong in-plane potential gradient that could act as a potential mechanism for a strong RB splitting of surface states.…”

“…This structure was recently observed in an independent ARPES experiment. 21 It was attributed to a surface resonance derived from the Shockley surface state of Pt(111), which is split on both sides of by a large RB-type effect. This state, which for clean Pt(111) is located above E F in a hybridization gap, moves below E F as a result of the interaction with the Ag overlayer.…”

Clean Ir(111) and Pt(111) electronic surface states: A first-principle fully relativistic investigation

“…In Pt(111) the nature of the L-gap surface states is more elusive and a subject of discussion since several years. [26] Ref. pt111_bendounan finds them above the bulk states as in Au(111) and with a spin-orbit splitting larger than in Au(111).…”

Monitoring the formation of interface-confined mixture by photoelectron spectroscopy

“…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. 18 In continuation of this work, we present here a quantitative description of modifications in the Pt(111) valence band induced through segregation processes caused by deposition of an Ag layer followed by an annealing of the sample. The evolution of the surface resonance as a function of the annealing temperature has been investigated by angle-resolved photoemission spectroscopy (ARPES) and directly compared to theoretical one-step photoemission calculations.…”