K. N. Altmann

One-dimensional electronic states at surfaces

One-dimensional electron systems can now be synthesized at stepped surfaces by self-assembly of atomic and molecular chains. A wide variety of adsorbate and substrate combinations provides opportunities for systematically tailoring electronic properties, such as the intra-chain and inter-chain coupling, the electron count, magnetic moment and the Coulomb interaction. Angle-resolved photoemission with synchrotron radiation is an ideal probe to reveal the complete set of quantum numbers for electrons at an ordered surface, i.e. energy, momentum parallel to the surface, spin and point group symmetry. Interesting electronic features are discussed, such as spin-charge separation in a Luttinger liquid, charge density waves, the Peierls gap, mixed dimensionality and one-dimensional quantum well states.

Fermi surfaces of surface states on Si(111)-Ag, Au

Metallic surface states on semiconducting substrates provide an opportunity to study low-dimensional electrons decoupled from the bulk. Angle resolved photoemission is used to determine the Fermi surface, group velocity, and effective mass for surface states on

Spin-dependent band structure, Fermi surface, and carrier lifetime of permalloy

\mathrm{Si}(111)\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}\ensuremath{-}\mathrm{Ag},

Single domain Ca-induced reconstruction on vicinal Si(1 1 1)

\mathrm{Si}(111)\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}\ensuremath{-}\mathrm{Au},

Electronic states in magnetic nanostructures

and

Enhanced spin polarization of conduction electrons in Ni explained by comparison with Cu

\mathrm{Si}(111)\sqrt{21}\ifmmode\times\else\texttimes\fi{}\sqrt{21}\ensuremath{-}(\mathrm{Ag}+\mathrm{Au}).

Photoelectron spectroscopy of atomic wires

For

Connection between Structure and Electronic Properties in Epitaxial Magnetic Layers

\mathrm{Si}(111)\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3}\ensuremath{-}\mathrm{Ag}

Current status of the Synchrotron Radiation Center

the Fermi surface consists of small electron pockets populated by electrons from a few % excess Ag. For