Figure 1

Dispersion in (a) and spin orientation in (b) for the Rashba model in a two-dimensional electron gas: The spin-orbit interaction splits the free-electron parabola (dashed line) into the branches $E_{\pm }$. The spin orientation, indicated by arrows, of the inner and outer branch depends on the sign of the Rashba parameter $\alpha$ and of the effective mass $m^{*}$.Reuse & Permissions

Figure 2

Spin-integrated photoemission from Bi/Cu(111) obtained with Xe i excitation. (a) and (b) show the Fermi surface and the band structure along the $\overline{\Gamma }\overline{K}$ direction. In (c) we display energy distribution curves around $\overline{\Gamma }$ obtained from the same data set as the map in (b).Reuse & Permissions

Figure 3

Spin-resolved electronic structure of Bi/Cu(111). In (a) and (b) we show spin-resolved energy distribution curves along $\overline{\Gamma }\overline{K}$ for negative and positive emission angles. The respective excitation energies are indicated. The spectra in (a) were recorded with an energy resolution of 160 meV, and the ones in (b) with 160 meV (He i) and 100 meV (Xe i). In (c) we present a first-principles calculation of the spin-resolved surface electronic structure. (d) shows a high-resolution photoemission map of Bi/Cu(111) (taken from Ref. 28). Additional markers indicate the peak positions obtained from the spin-resolved datasets in (a) and (b). For all panels the spin-quantization axis is in plane and perpendicular to the wave vector $k_x$ ($\overline{\Gamma }\overline{K}$). Red (light) and blue (dark) symbols correspond to a spin orientation parallel to $y$ and $-y$, respectively. In (d) closed (open) symbols indicate data points obtained with Xe I (He I) excitation.Reuse & Permissions

Figure 4

First-principles calculation of the partial charge density of the $s{p}_z$ state on Bi/Cu(111) at the $\overline{\Gamma }$ point. (a) One-dimensional charge density profile along the $z$ direction [(111) direction]. The Bi atom is located at $z=0$ and the vacuum side corresponds to positive $z$ values. The charge was averaged in the $xy$ plane within an interval of $\pm$0.07 Å around the nucleus. (b) Two-dimensional cut through the charge density in the [$1\overline{1}0$] plane. One Bi atom in the center and two Cu atoms are indicated.Reuse & Permissions