Journal
PHYSICAL REVIEW B
Volume 78, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.235434
Keywords
boron compounds; Green's function methods; III-V semiconductors; semiconductor nanotubes; thermal conductivity
Funding
- European Union [MIRG-CT-2006039302]
- NSF [0651310, 0651427]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0651427] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0651310] Funding Source: National Science Foundation
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It has been argued that the experimentally observed limitation of heat transport through boron nitride nanotubes is due to intershell scattering rather than to inefficient heat transfer to inner shells. Using an atomistic Green's function calculation, we present evidence that on the contrary, intershell or any other type of scattering along the nanotubes is not the main limiting mechanism, and heat conduction restricted to a few layers is responsible for the low thermal conductivities experimentally measured. Our results also indicate that anharmonic scattering in boron nitride is relatively weak, which might lead to considerably larger thermal conductivity for well-contacted nanotubes than previously reported.
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