Abstract
The band structures of 6H SiC and 4H SiC calculated by means of the full-potential linear-muffin-tin-orbital method are used to determine the effective mass tensors for their conduction-band minima. The results are shown to be consistent with recent optically detected cyclotron resonance measurements, which find the ratio of cyclotron masses for B\ensuremath{\perp}c to B\ensuremath{\parallel}c to be larger (smaller) than unity for the 6H (4H) polytype. However, contrary to previous suggestions, appreciable anisotropies in the c plane are found. For 6H SiC, a strong dependency on band filling is predicted because of the occurrence of a double-well minimum along the ML axis. The calculated mass tensors for 3C and 2H are also reported.
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