Low-dimensional systems on self-structured metal surfaces

One-dimensional electronic systems on metal Surfaces can be obtained e.g. b y step decoration, lateral confinement in stress domains or by self-assembl ed adsorbate-chain systems. With Pt(1 1 0) serving as a template, a monolay er of Pt-halogen-Pt chains can be grown. This is a surface-analog of haloge n-bridged transition-metal chain molecules. Similar to the latter. the halo acn/Pt monolayer develops a charge density wave (CDW) phase if suitably dop ed. The transition into the CDW groundstate is directly observed by scannin g tunnelling microscopy (STM). The Fermi surface determined from angle-reso lved UV-photoemission (ARUPS) is consistent with the CDW structure observed by STM. Close to E-F, ARUPS spectra are dominated by many-body effects. Di fferent doping allows to switch between randomly pinned. chaotic soliton an d globally ordered CDW phases. (C) 2001 Elsevier Science B.V. All rights re served.