1. Department of Physics
2. Indian Institute of Science
3. Bangalore 560012
4. India
5. Institute of Physical Chemistry
6. University of Vienna
7. A-1090 Wien
8. Austria
9. Christian Doppler Laboratory for Thermoelectricity
10. Vienna University of Technology
11. Vienna
12. Institute of Solid State Physics
13. Department of Materials Engineering
14. Bangalore 560 012
15. Faculty Center for Nanostructure Research
16. Institute of Mineralogy and Crystallography
17. A-1090 Vienna