Experimental studies of an In/Pb binary surface alloy on Ge(111)

Abstract

In this study, we present a binary In/Pb surface alloy on Ge(111) formed by evaporating In on the Pb/Ge(111) 3 3 × β phase. A well-defined 3×3 periodicity is formed after annealing, as verified by both low energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Overview STM images show a clear 3×3 periodicity. Detailed STM images reveal protrusions corresponding to atomic sized features with a local hexagonal arrangement. Each 3×3 unit cell contains nine such features indicating a structure with 9 atoms per 3×3 cell in the topmost layer. Based on angle resolved photoelectron spectroscopy (ARPES) data, we have identified five surface bands within the bulk band gap. Four of them cross the Fermi level leading to a metallic character of the surface. The dispersions of these bands have been mapped in detail along two high symmetry directions of the surface Brillouin zone. Constant energy contours, mapped in two dimensional k-space, show interesting features. In particular, the occurrence of two differently rotated hexagon like contours is presented.

Диффузия Ag и Pb по поверхности Ge(111)-3x2sqrt(3)sqrtSn

“…Наиболее широко проводились исследования на кремнии и германии однокомпонентных структур таких металлов как Ag, Pb, Sn, Au, In, Tl [1][2][3][4][5][6]. Использование второго элемента может приводить к двухкомпонентным структурам (Ag, Au) [7], (In, Au) [8], (In, Pb) [9,10], (Sn, Ag) [11,12]. Второй элемент в некоторых случаях, может использоваться в качестве сурфактанта.…”

Ag and Pb diffusion on Ge(111)-3x2sqrt(3)sqrtSn surface

“…The most widely conducted studies of singlecomponent structures of metals such as Ag, Pb, Sn, Au, In, Tl on silicon and germanium [1][2][3][4][5][6]. Using the second element can lead to two-component structures (Ag, Au) [7], (In, Au) [8], (In, Pb) [9,10], (Sn, Ag) [11,12]. The second element, in some cases, can be used as a surfactant.…”

2D Tl–Pb compounds on Ge(1 1 1) surface: atomic arrangement and electronic band structure

“…It is worth noting also a modern trend of using more than a single atomic species when fabricating metal-induced reconstructions on semiconductor surfaces [32][33][34][35][36][37][38][39][40][41][42][43]. The two-dimensional compounds represent a novel class of materials which can possess advanced properties unavailable in the mono-species systems.…”