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Second-harmonic generation in SiC polytypes

1998; American Physical Society; Volume: 57; Issue: 16 Linguagem: Inglês

10.1103/physrevb.57.9705

1095-3795

Sergey N. Rashkeev, Walter R. L. Lambrecht, B. Segall,

Semiconductor materials and devices

LMTO calculations are presented for the frequency dependent second harmonic generation (SHG) in the polytypes 2H, 4H, 6H, 15R and 3C of SiC. All independent tensor components are calculated. The spectral features and the ratios of the 333 to 311 tensorial components are studied as a function of the degree of hexagonality. The relationship to the linear optical response and the underlying band structure are investigated. SHG is suggested to be a sensitive tool for investigating the near band edge interband excitations.