Fig. 2: Electronic structures of unoccupied Rashba spin-split bands. | npj Quantum Materials

Fig. 2: Electronic structures of unoccupied Rashba spin-split bands.

From: Orbital-enhanced warping effect in px,py-derived Rashba spin splitting of monatomic bismuth surface alloy

Fig. 2

From a, an asymmetric peak at 0.23 V has been resolved from dI/dU curve on BiCu2 (black line). In contrast to BiCu2, the dI/dU curve on Bi[2012] is rather featureless (blue line). (stabilization parameters: U = + 0.7 V, I = 1.0 nA, T = 4.5 K). From b, a pronounced peak at 1.6 V as indicated by red arrow together with a shoulder at 1.4 V (blue arrow) has been observed on BiCu2, but no characteristic features can be observed from the dI/dU curve taken at Bi[2012]. (stabilization parameters: U = + 2.0 V, I = 1.0 nA, T = 4.5 K). c Orbital-decomposed band structure of the BiCu2 surface. The red, green, and blue spheres indicate, respectively, the pz, s, and px + py orbital contributions. DOS from band edges and the nearby crossing point of unoccupied Rashba bands resulting in the peak positions in d. The crossing points of the Rashba bands at \({\it{\bar {\Gamma}}}\) correspond to the peak positions in d. d The DOS integrated over the zone-center region near the \({\it{\bar {\Gamma}}}\) point for comparison with our scanning tunneling spectroscopy (STS) results. The left (right) panel shows DOS with ∆E = 0.01 eV (∆E = 0.1 eV) broadening.

Back to article page