Electronic structure study of ultrathin Ag(111) films modified by a Si(111) substrate and √3×√3-Ag2Bi surface


 

Angle-resolved photoemission spectroscopy experiments show that the electronic structure of a Ag(111) film grown on Si(111) is markedly perturbed by the formation of a √3×√3-Ag2Bi Rashba-type surface alloy.  

M. Ogawa et al., J. Phys.: Condens. Matter 24 (2012) 115501

Four spin-split surface states, with different band dispersions and energy contours, intercept and hybridize selectively with the sp-derived quantum well states of the Ag layer. 

Detailed two-dimensional band mapping of the system was carried out and constant energy contours at different energies result in hexagonal-, star- and flower-like distortions of the quantum well states as a result of various interactions. Further wavy-like modulations of the electronic structure of the film are found to originate from umklapp reflections of the Ag film states according to the surface periodicity. 



 


 
Ultima modifica il Martedì, 19 Maggio 2015 13:10