Report on the Mini-Colloquium
Brighton 7-11 April 2002
CMD19/CMMP2002 SESSION "MINERALOGY AND GEOPHYSICS"
Sponsored by European Science Foundation "Electronic Structure Calculations for Elucidating the Complex Atomistic Behaviour of Solids and Surfaces" (Psi-k)
Organized by Lubomir Benco, Vienna University, Austria Bjorn Winkler, Frankfurt University, Germany
The aim of the mini-colloquium was to gather geophysicists and electronic-structure scienticsts thus supporting the interdisciplinary scientific exchange and the establishment of a common language for mineralogy oriented researchers.
The colloquium consisted of 5 talks, two ivited (30') and three contributing presentations (20'). The contributions demonstrate that two main directions have been emerging in computational mineralogy and geophysics. Application of ab-initio calculations to larger and more complicated systems (contribution 1 and 3) and development of novel Monte Carlo approaches to characterize specific properties of materials (contribution 2, 4 and 5).
"Magnetoelectronics"
Sponsored by European Science Foundation "Electronic Structure Calculations for Elucidating the Complex Atomistic Behaviour of Solids and Surfaces" (Psi-k)
Organized by A. Fert (Orsay), L. Molenkamp (Wuerzburg), P.H. Dederichs (Juelich)
The Mini-Colloquium consisted of four invited talks, the abstract of which are attached below. In the first invited paper ("Half-metallic ferromagnetic oxides for magnetoelectronics: Material's issues") J. Fontcuberta reported, that the tunnel magnetoresistance of tunnel junctions based on half-metallic oxides greatly increased due to improvement of the interfaces. In his paper "Materials-specific theory for spin electronics" P.J. Kelly discussed the description of spindependent transport in layered systems based on the Landauer-Buettiker formalism and using the tight-binding LMTO method, with applications to GMR and TMR, Andreev reflection and spin injection. Peter Levy highlighted in his paper "Spin-polarized current-driven switching of magnetic layers" the present understanding of the magnetization switching by a spin polarized current, stressing the differences between the longitudinal and transversal spin accumulation. D. Ferrand ("Ferromagnetic semiconductors") reported recent progress in the young field of dilute magnetic semiconductors, by considering Mn-doped III-V semiconductors (GaAs, InAs) as well as 1I-VI ones (CdTe quantum wells and ZnTe epilayers).
The mini-colloquium was rounded of by a quite good poster session of 19 experimental and theoretical contributions. Due to the many other mini-colloquia, in total the EPS conference was interesting and successful, although the organization was not perfect.
Peter H. Dederichs
Sponsored by European Science Foundation "Electronic Structure Calculations for Elucidating the Complex Atomistic Behaviour of Solids and Surfaces" (Psi-k)
Organized by W. Richter (TU-Berlin, Germany) and J. Neugebauer (FHI-Berlin, Germany)
The mini-colloquium "Wide bandgap semiconductors" at the CMD19/CMMP2002 meeting, organized by Prof. W. Richter (TU-Berlin, Germany) and Dr. J. Neugebauer (FHI-Berlin, Germany) covered advances in basic science issues as well as in novel applications of wide bandgap semiconductors. The 2 invited and 4 contributed talks covered various materials systems (groupIII nitrides, SiC, group-II oxides) and addressed various materials related issues such as native point and extended defects, dopants, surfaces, device structures. For a brief summary of the invited talks see the abstracts below.
J. Neugebauer
"Electronic Structure of Correlated Systems"
Sponsored by European Science Foundation "Electronic Structure Calculations for Elucidating the Complex Atomistic Behaviour of Solids and Surfaces" (Psi-k)
Organized by W.M. Temmerman (Daresbury), A. Georges (Paris), and T. Pruschke (Augsburg)
The Mini-Colloquium "Electronic Structure of Correlated Systems" consisted of one invited talk, whose abstract is given below, four contributed talks and 15 posters. The invited talk was by Sasha Lichtenstein on "Realistic description of strongly correlated materials", utilising the dynamical mean field theory (DMFT) in conjunction with LDA, the so-called LDA+DMFT. Sasha showed how to go beyond the local spin density approximation and include spin and charge fluctuations with the DMFT. The central objects of the presented results were the spectral functions. These allow to make direct contact with photoemission data, which the speaker did quite succesfully.
"Non-Collinear Spin Structures"
Sponsored by European Science Foundation "Electronic Structure Calculations for Elucidating the Complex Atomistic Behaviour of Solids and Surfaces" (Psi-k)
Organized by J. Hafner (Wien), S. Blugel (Juelich), L. Nordstrom (Uppsala)
The minicolloquium consisted of 2 invited papers by G. Bihlmayer and M. Marsman and 3 contributed ones by E. Sjostedt, L.M. Sandratskii and L.A. Prozorova. The five abstracts are attached. In addition there were eight poster contributions.
More details may be found in newsletter 52 from page 19
