This work has been supported by the Russian Foundation for Basic Research through Grant 03-02-17219 and by the Russian Academy of Sciences Program Novel Materials Ф and StructuresУ. W.K. acknowledges a support from CNRSprogramm New THz Emitters and DetectorsУ, Region Ф Languedoc Roussillon, and from the French Ministry of the Research and New Technologies program ACI Nanosciences and NanotechnologiesУ.
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