کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5425412 | 1395855 | 2007 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Orbital origin and matrix element effects in the Ag/Si(1 1 1)-(3Ã3)R30° Fermi surface Orbital origin and matrix element effects in the Ag/Si(1 1 1)-(3Ã3)R30° Fermi surface](/preview/png/5425412.png)
The Fermi surface (FS) of the Ag/Si(1Â 1Â 1)-3Ã3 reconstruction with an excess of Ag has been mapped by angle resolved photoemission spectroscopy with polarized light in a wide region of the reciprocal space and with different detection geometries. In contrast to previous results, a strong polarization dependence is observed. Applying the dipole selection rules, it is found that the surface state at the Fermi level, S1 state, has odd symmetry with respect to the mirror plane of the honeycomb-chained triangle structure, indicating that it is mainly derived from Ag 5px and 5py orbitals. This conclusion is revised in the new frame of a inequivalent-triangle structure for the Ag/Si(1Â 1Â 1)-3Ã3 at room temperature. Besides, strong modulations of the intensity distribution are found that deviate the Fermi surface pattern from its expected two-dimensional periodical behavior.
Journal: Surface Science - Volume 601, Issue 3, 1 February 2007, Pages 742-747