Abstract
Using the scattering matrix method, we investigate the effect of the evanescent modes on ballistic transport probability and thermal conductance in T-shaped and concavity-shaped quantum structures at low temperatures. The results show that the evanescent modes play different roles in the transport possibility and the thermal conductance in both T-shaped and concavity-shaped quantum structures. The evanescent modes can enhance thermal conductance in the concavity-shaped structure and suppress thermal conductance in the T-shaped structure. A brief analysis of these results is given.
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