OPTICAL EXCITATIONS IN HEXAGONAL NANONETWORK MATERIALS
Harigaya K.

Поступила в редакцию: 1 Марта 2003

PACS: 78.66.Tr, 71.35.Cc, 73.61.Wp

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Optical excitations in hexagonal nanonetwork materials, for example, Boron-Nitride (BN) sheets and nanotubes, are investigated theoretically. Exciton dipoles directed from the B site to the N site are considered along the BN bond. When the exciton hopping integral is restricted to the nearest neighbors, two flat bands of excitons appear. The symmetry of these exciton bands is optically forbidden. Possible relations with experiment are discussed.