Z. Ikonic et al., DIRECT OPTICAL-TRANSITIONS IN INDIRECT SEMICONDUCTORS - THE CASE OF GE TWINNING SUPERLATTICES, Physical review. B, Condensed matter, 52(3), 1995, pp. 1474-1476
The folded direct optical transitions in a recently proposed structure
-the twinning superlattice-in germanium are calculated and discussed.
The absorption coefficient of this structure is found to exceed the bu
lk Ge value by at least an order of magnitude, but is still small comp
ared to that for direct-gap semiconductors.