128 citations
- University of StuttgartDE7 papers
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- Ames National LaboratoryUS3 papers
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- Forschungszentrum JülichDE2 papers
- Technische Universität BraunschweigDE2 papers
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8 papers · 1 filter
Investigating Atomic Details of the CaF(111) Surface with a qPlus Sensor
Franz J. Giessibl, Michael Reichling
The (111) surface of CaF has been intensively studied with large-amplitude frequency-modulation atomic force microscopy and atomic contrast formation is now well understood. It…
The Multiplicity Conjecture in low codimensions
Juan C. Migliore, Uwe Nagel, Tim Römer
We establish the multiplicity conjecture of Herzog, Huneke, and Srinivasan about the multiplicity of graded Cohen-Macaulay algebras over a field, for codimension two algebras and f…
Exchange parameters in Fe-based molecular magnets
A. V. Postnikov, G. Bihlmayer, S. Bluegel
The calculation of interatomic magnetic exchange interactions entering the Heisenberg model from the standpoint of the density functional theory (DFT) is outlined for two Fe-based…
Strong Coulomb effects in hole-doped Heisenberg chains
J. Schnack
Substances such as the ``telephone number compound'' Sr14Cu24O41 are intrinsically hole-doped. The involved interplay of spin and charge dynamics is a challenge for theory. In this…
Exact diagonalization studies of doped Heisenberg spin rings
J. Schnack, F. Ouchni
Motivated by magnetization studies of the "telephon number compound" Sr_14Cu_24O_41 we investigate doped Heisenberg spin rings by means of complete numerical diagonalization of a H…
Online Searching with an Autonomous Robot
Sandor P. Fekete, Rolf Klein, Andreas Nuechter
We discuss online strategies for visibility-based searching for an object hidden behind a corner, using Kurt3D, a real autonomous mobile robot. This task is closely related to a nu…