WORKSHOP PROPOSAL

1. Joint CECAM-PsiK workshop:

"The anomalous Hall effect: Recent advances via the geometric-phase approach".

R. Resta, resta@democritos.it
A.H. MacDonald, macd@physics.utexas.edu
Q. Niu, niu@physics.utexas.edu

2. There have been sweeping advances since 2002 in understanding and computing the AHE from first principles.

The Hall resistivity of ferromagnets has an ordinary contribution (proportional to the external magnetic field strength), and an anomalous contribution (often assumed proportional to the sample magnetization). The phenomenon of AHE is known since more than a century, but its interpretation was controversial. It is by now clear that the AHE is dominated by band-structure effects and can be computed as a suitable Berry phase. There are possible relevant implications for spintronics, and for orbital magnetization at large. A CECAM event in 2005 is the ideal forum for discussing novel ideas and work in progress.

3, 4 & 5. At the present date, we plan to invite 17 (+3 of us)

senior condensed matter theorists, chosen among those who have contributed significant advances in understanding and computing: electric polarization, orbital magnetization, anomalous Hall effect, quantum Hall effect, and Berry phases. Notably, we include scientists from the computational electronic-structure community, as well as scientists from a wider theoretical-physics community. The preliminary list of

20 senior scientists includes: M. Altarelli, C.M. Canali, A. Dal Corso, O. Eriksson, J. Fernandez-Rossier, G.Y. Guo, F.D.M. Haldane, T. Jungwirth, S. G. Louie, A.H. MacDonald, F. Mauri, N. Nagaosa, Q. Niu, R. Resta, D. Sebastiani, J. Sinova, D. Vanderbilt, G. Vignale, Y. Yao.

A few (5-10) junior participants will be invited later, depending on budget.

6 & 7. The standard 7k from CECAM, plus 4k from PsiK (most of

them needed for inviting junior people).

8. Event in Lyon, June 2005 (3 days).