Ziegler, M., Kroeger, J., Berndt, R., Filinov, A., Bonitz, M.
Cesium adsorption structures on Ag(111) were characterized in a low-temperature scanning tunneling microscopy experiment. At low coverages, atomic resolution of individual Cs atoms is occasionally...
Controlling the Kondo Effect in CoCu_n Clusters Atom by Atom (2008)
Neel, N., Kroeger, J., Berndt, R., Wehling, T., Lichtenstein, A., Katsnelson, M. I.
Clusters containing a single magnetic impurity were investigated by scanning tunneling microscopy, spectroscopy, and ab initio electronic structure calculations. The Kondo temperature of a Co atom...
Quantized Conductance of a Single Magnetic Atom (2008)
Neel, N., Kroeger, J., Berndt, R.
A single Co atom adsorbed on Cu(111) or on ferromagnetic Co islands is contacted with non-magnetic W or ferromagnetic Ni tips in a scanning tunneling microscope. When the Co atom bridges two...
Rotation of C60 in a single-molecule contact (2007)
Neel, N., Limot, L., Kroeger, J., Berndt, R.
The orientation of individual C60 molecules adsorbed on Cu(100) is reversibly switched when the tip of a scanning tunneling microscope is approached to contact the molecule. The probability of...
Unoccupied states of individual silver clusters and chains on Ag(111) (2007)
Sperl, A., Kroeger, J., Neel, N., Jensen, H., Berndt, R., Franke, A., ...
Size-selected silver clusters on Ag(111) were fabricated with the tip of a scanning tunneling microscope. Unoccupied electron resonances give rise to image contrast and spectral features which shift...
Conductance and Kondo effect of a controlled single atom contact (2006)
Neel, N., Kroeger, J., Limot, L., Palotas, K., Hofer, W. A., Berndt, R.
The tip of a low-temperature scanning tunneling microscope is brought into contact with individual Kondo impurities (cobalt atoms) adsorbed on a Cu(100) surface. A smooth transition from the...
Adsorption geometry of Cu(111)-Cs studied by scanning tunneling microscopy (2006)
Von Hofe, Th., Kroeger, J., Berndt, R.
Using scanning tunneling microscopy at low temperatures we investigated the adsorbate system Cu(111)-Cs for various cesium coverages. At low coverages we observe a hexagonally ordered Cs adsorption...
Molecular Orbital Shift of Perylenetetracarboxylic-Dianhydride (2005)
Kroeger, J., Jensen, H., Berndt, R., Rurali, R., Lorente, N.
Using low-temperature scanning tunneling microscopy we find that perylenetetracarboxylic-dianhydride on Au(788) exhibits three coexisting adsorption phases. Single-molecule tunneling spectroscopy...
Role of elastic scattering in electron dynamics at ordered alkali overlayers on Cu(111) (2005)
Corriol, C., Silkin, V. M., Sanchez-Portal, D., Arnau, A., Chulkov, E. V., Echenique, P. M., ...
Scanning tunneling spectroscopy of p(2x2) Cs and Na ordered overlayers on Cu(111) reveals similar line widths of quasi two-dimensional quantum well states despite largely different binding energies....
Resonator design for surface electron lifetime studies using scanning tunneling spectroscopy (2005)
Crampin, S., Jensen, H., Kroeger, J., Limot, L., Berndt, R.
We derive expressions for the lossy boundary-scattering contribution to the linewidth of surface electronic states confined with atomic corrals and island resonators. Correcting experimentally...
Electron dynamics in vacancy islands (2004)
Jensen, H., Kroeger, J., Berndt, R., Crampin, S.
The dynamics of Ag(111) surface state electrons confined to nanoscale hexagonal and triangular vacancy islands are investigated using scanning tunneling spectroscopy. The lifetimes of quantised...
Phase coherence length and quantum interference patterns at step edges (2004)
Crampin, S, Kroeger, J, Jensen, H, Berndt, R
The accepted approximation used to describe quantum interference patterns at steps is shown to be incorrect. As a result, electron lifetimes determined using it are in error by a factor 2.
Surface-State Localization at Adatoms (2004)
Limot, L., Pehlke, E., Kroeger, J., Berndt, R.
Low-temperature scanning tunneling spectroscopy of magnetic and non-magnetic metal atoms on Ag(111) and on Cu(111) surfaces reveals the existence of a common electronic resonance at an energy below...
Stark effect of the Au(111) and Cu(111) surface states (2004)
Kroeger, J., Limot, L., Jensen, H., Berndt, R., Johansson, P.
We present a low-temperature scanning tunneling spectroscopy study of the Au(111) and of the Cu(111) surface states showing that their binding energy increases when the tip is approached towards the...
Pfaller, M. A., Boyken, L., Hollis, R. J., Kroeger, J., Messer, S. A., Tendolkar, S., ...
The echinocandins are being used increasingly as therapy for invasive candidiasis. Prospective sentinel surveillance for the emergence of in vitro resistance to the echinocandins among invasive...