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We report simultaneous measurements and ab initio calculations of the second-order nonlinear coefficients for SiC polytypes. Our measured values for χzzz (χzxx) are 18 (−4) pm/V for 4H SiC and 24 (−4) pm/V for 6H SiC. They are in good agreement with our theoretical results.
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Niedermeier et al. (1999) studied this question.
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