PRESSURE DEPENDENCES OF BAND-GAPS AND OPTICAL-PHONON FREQUENCY IN CUBIC SIC

被引：48
作者：
CHEONG, BH
CHANG, KJ
COHEN, ML
机构：
[1] UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA
[2] UNIV CALIF BERKELEY, DIV MAT SCI, BERKELEY, CA 94720 USA
来源：
PHYSICAL REVIEW B | 1991年 / 44卷 / 03期
关键词：
D O I：
10.1103/PhysRevB.44.1053
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The high-pressure behavior of the direct and indirect band gaps in zinc-blende-structure SiC is examined with use of self-consistent ab initio pseudopotential calculations. The fundamental band gap from GAMMA-15-nu to X1c is found to decrease linearly with pressure up to 200 kbar. This result disagrees with a recent experimental finding of strong sublinear behavior at pressures of 10 to 15 kbar. The linear pressure coefficients of the fundamental band pp and the transverse-optical-phonon frequency at the GAMMA-point in the Brillouin zone are in good agreement with measured values.
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页码：1053 / 1056
页数：4
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