Adsorbate‐Induced Modifications in the Optical Response of the Si(553)–Au Surface

Abstract

atoms on selected semiconducting surfaces leads to a variety of ordered, atomic-scale chain structures. [1][2][3][4][5][6][7][8][9][10][11] Au-induced reconstructions on vicinal Si(111) surfaces have been studied intensively for years, as small coverages of Au stabilize the Si terraces by the formation of Au rows, which are expected to feature exciting physical properties such as quantization of conductance, spin-charge separation, charge and spin density waves, and Luttinger liquid behavior. [12][13][14][15][16] The Si(553)-(5 Â 2)-Au surface was first investigated by Crain et al., [17] and reported to show metallic states in the electronic band structure by angle-resolved photoemission spectrosopy. Since then, numerous lines of research have emerged, dedicated to the investigation of the atomic structure, [18][19][20][21] lattice dynamics, [22] spin patterns, [23][24][25] phase transitions, [26,27] as well as electronic structure and its adsorptioninduced modifications. [28][29][30][31][32] According to our current knowledge of the system, the hightemperature phase of the Si(553)-Au surface is stable from room temperature down to about 120 K. It consists of a double Au