See also: V.S. Zapasskii, I.I. Ryzhov, A.V. Kavokin, G.A. Smolenskii
PACS: 76.30.-v, 07.57.Pt, 78.20.Ls, 76.70.Hb, 42.25.-p, 75.25.+z, 75.30.-m, 78.20.-e