1. Institute of Semiconductor Physics, Novosibirsk, 630090 Russian Federation
2. Novosibirsk State University, Novosibirsk, 636090 Russian Federation
3. Physique de la matière
condensée, Ecole Polytechnique,
CNRS, F-91128 Palaiseau, France
4. Institute of Strength Physics and Materials Science, Tomsk, 636021 Russian
Federation
5. Tomsk State University, Tomsk, 634050 Russian Federation
6. Laboratorio Nazionale TASC, INFM-CNR, 34012 Trieste, Italy
7. University of Johannesburg, Auckland Park 2006, South Africa
8. Dipartimento di Ingegneria dei
Materiali e dell’Ambiente, Universita di Modena e Reggio Emilia and CNISM, Via Vignolese 905, 41100
Modena, Italy