1. Physics Department, University of Trieste, Strada Costiera 11, I-34151
Trieste, Italy
2. Institute
of Theoretical Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
3. IOM-CNR DEMOCRITOS, Theory@Elettra
Group, Trieste, Italy and Italian Consortium on Materials Science
and Technology (INSTM)
4. IOM-CNR DEMOCRITOS, Trieste,
Italy
5. Physics Department
and CENMAT, University of Trieste, via
Valerio 2, I-34127 Trieste,
Italy
6. IOM-CNR Laboratorio TASC,
Area Science
Park, S.S. 14 km 163.5, I-34149 Basovizza (Trieste), Italy
7. Sincrotrone Trieste S.C.p.A.,
Area Science Park, S.S. 14 km 163.5, I-34149 Trieste, Italy