Abstract
We study ballistic phonon transport and thermal conductance associated with six low-lying vibrational modes in a quadrate nanowire superlattice at low temperatures. The results show that the transmission rates of the six vibrational modes display periodic forbidden regions of frequencies and have different relations with geometrical details of the nanowire superlattice. The thermal conductances contributed from different vibrational modes show different characteristics. On the basis of the theoretical analysis and calculated simulation, quantum restricted effects on ballistic thermal conductance in the quadrate nanowire superlattice are revealed.
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