Publications (12)
Study of radon reduction in gases for rare event search experiments
K. Pushkin, C. Akerlof, D. Anbajagane +15
The noble elements, argon and xenon, are frequently employed as the target and event detector for weakly interacting particles such as neutrinos and Dark Matter. For such rare proc…
Self-organized atomic nanowires of noble metals on Ge(001): atomic structure and electronic properties
J. Schaefer, S. Meyer, C. Blumenstein +9
Atomic structures of quasi-one-dimensional (1D) character can be grown on semiconductor substrates by metal adsorption. Significant progress concerning study of their 1D character…
Fermi Surface and Electron Correlation Effects of Ferromagnetic Iron
J. Schaefer, M. Hoinkis, Eli Rotenberg +2
The electronic band structure of bulk ferromagnetic iron is explored by angle-resolved photoemission for electron correlation effects. Fermi surface cross-sections as well as band…
Renormalization of Bulk Magnetic Electron States at High Binding Energies
A. Hofmann, X. Y. Cui, J. Schaefer +11
The quasiparticle dynamics of electrons in a magnetically ordered state is investigated by high-resolution angle-resolved photoemission of Ni(110) at 10 K. The self-energy is extra…
Symmetry-Breaking Phase Transition without Peierls Mechanism in Conducting Monoatomic Chains
C. Blumenstein, J. Schaefer, M. Morresi +3
The one-dimensional (1D) model system Au/Ge(001), consisting of linear chains of single atoms on a surface, is scrutinized for lattice instabilities predicted in the Peierls paradi…
Unusual quasi-one-dimensional electron dispersions in the spin-1/2 quantum magnet TiOCl
M. Hoinkis, M. Sing, J. Schaefer +8
We have studied the electronic structure of the spin-1/2 quantum magnet TiOCl by polarization-dependent momentum-resolved photoelectron spectroscopy. From that, we confirm the quas…
ROTSE All Sky Surveys for Variable Stars I: Test Fields
ROTSE Collaboration, C. Akerlof, S. Amrose +14
The ROTSE-I experiment has generated CCD photometry for the entire Northern sky in two epochs nightly since March 1998. These sky patrol data are a powerful resource for studies of…
Spin-Polarized Standing Waves in the Fermi Surface of a Ferromagnetic Thin Film
J. Schaefer, M. Hoinkis, Eli Rotenberg +2
The spin-selective electron reflection at a ferromagnetic-paramagnetic interface is investigated using Fe films on a W(110) substrate. Angle-resolved photoemission of the majority…
Evidence for Long-Range Spin Order Instead of a Peierls Transition in Si(553)-Au Chains
J. Aulbach, J. Schaefer, S. C. Erwin +5
Stabilization of the Si(553) surface by Au adsorption results in two different atomically defined chain types, one of Au atoms and one of Si. At low temperature these chains develo…
New Model System for a One-Dimensional Electron Liquid: Self-Organized Atomic Gold Chains on Ge(001)
J. Schaefer, C. Blumenstein, S. Meyer +2
Unique electronic properties of self-organized Au atom chains on Ge(001) in novel c(8x2) long-range order are revealed by scanning tunneling microscopy. Along the nanowires an exce…
Strictly One-Dimensional Electron System in Au Chains on Ge(001) Revealed By Photoelectron K-Space Mapping
S. Meyer, J. Schaefer, C. Blumenstein +5
Atomic nanowires formed by Au on Ge(001) are scrutinized for the band topology of the conduction electron system by k-resolved photoemission. Two metallic electron pockets are obse…
Conduction States with Vanishing Dimerization in Pt Nanowires on Ge(001) Observed with Scanning Tunneling Microscopy
J. Schaefer, D. Schrupp, M. Preisinger +1
The low-energy electronic properties of one-dimensional nanowires formed by Pt atoms on Ge(001) are studied with scanning tunneling microscopy down to the millivolt-regime. The cha…