Two-domains bulklike Fermi surface of Ag films deposited onto Si(111)-(7x7)

Details Two-domains bulklike Fermi surface of Ag films deposited onto Si(111)-(7x7) Two-domains bulklike Fermi surface of Ag films deposited onto Si(111)-(7x7)

2001-04-11

arxiv.org/abs/cond-mat/0104186v1

Physics

Condensed Matter

Materials Science

10 pages, 12 figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.66.035401

Thick metallic silver films have been deposited onto Si(111)-(7x7) substrates at room temperature. Their electronic properties have been studied by using angle resolved photoelectron spectroscopy (ARPES). In addition to the electronic band dispersion along the high-symmetry directions, the Fermi surface topology of the grown films has been investigated. Using ARPES, the spectral weight distribution at the Fermi level throughout large portions of the reciprocal space has been determined at particular perpendicular electron-momentum values. Systematically, the contours of the Fermi surface of these films reflected a sixfold symmetry instead of the threefold symmetry of Ag single crystal. This loss of symmetry has been attributed to the fact that these films appear to be composed by two sets of domains rotated 60$^o$ from each other. Extra, photoemission features at the Fermi level were also detected, which have been attributed to the presence of surface states and \textit{sp}-quantum states. The dimensionality of the Fermi surface of these films has been analyzed studying the dependence of the Fermi surface contours with the incident photon energy. The behavior of these contours measured at particular points along the Ag $\Gamma$L high-symmetry direction puts forward the three-dimensional character of the electronic structure of the films investigated.

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