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(Color online) (a) Top view of a CdS or CdSe supercell having wurtzite structure. (b) The supercell that has infinite length along the  direction. (c) Top view of the optimized CdS or CdSe NW. Orange circles represent S or Se atoms and yellow circles denote Cd atoms.
(Color online) Band structure of (a) bulk CdSe and (b) the CdSe NW. Density of states of (c) the CdS NW and (d) the CdSe NW.
(Color online) (a) Highest occupied valence band and (b) the lowest unoccupied conduction band of the CdS NW at point.
(Color online) (a) Dielectric function along the  direction of bulk CdSe and the CdSe NW. (b) The birefringence of CdS and CdSe bulks and NWs. (c) Absorption and (d) loss function along the  direction of CdS and CdSe NWs and bulk CdSe.
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