ZhETF, Vol. 124,
No. 6,
p. 1398 (December 2003)
(English translation - JETP,
Vol. 97, No. 6,
p. 1246,
December 2003
available online at www.springer.com
)
OPTICAL EXCITATIONS IN HEXAGONAL NANONETWORK MATERIALS
Harigaya K.
Received: March 1, 2003
PACS: 78.66.Tr, 71.35.Cc, 73.61.Wp
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.
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