The squared component of the group velocity weighted by the phonon density of states: (a) (growth) direction and (b) (in-plane) direction for SLs , , and . Corresponding quantities of bulk Si and Ge are also shown for comparison.
Heat conductivities [defined by Eq. (5)] in (a) and (b) directions of various SLs and alloys at room temperature .
Configurations of four interfaces for SL Rough (1), where solid circles are Ge atoms and hollow squares are Si atoms. The SL is calculated with a conventional unit cell, that is, . These interface configurations are generated by random numbers.
Numerical data used in calculations and calculated results for various SLs and alloys. The unit of velocity is , the unit of conductivity is .
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