**Thermal conductivity of Bi2Te3 tilted nanowires, a molecular dynamics
study**

S Li and L Chaput and N Stein and C Frantz and D Lacroix and K Termentzidis, APPLIED PHYSICS LETTERS, 106, 233108 (2015).

DOI: 10.1063/1.4922480

Evidence for an excellent compromise between structural stability and
low thermal conductivity has been achieved with tilted Bi2Te3 nanowires.
The latter ones were recently fabricated and there is a need in modeling
and characterization. The structural stability and the thermal
conductivity of Bi2Te3 nanowires along the tilted **015*** direction and
along the **010** direction have been explored. For the two configurations
of nanowires, the effect of the length and the cross section on the
thermal conductivity is discussed. The thermal conductivity of infinite
size tilted nanowire is 0.34W/m K, significantly reduced compared to
nanowire along the **010** direction (0.59W/m K). This reveals that in
Bi2Te3 nanowires the structural anisotropy can be as important as size
effects to reduce the thermal conductivity. The main reason is the
reduction of the phonon mean free path which is found to be 1.7 nm in
the tilted nanowires, compared to 5.3nm for the nanowires along the
**010** direction. The fact that tilted Bi2Te3 nanowire is mechanically
stable and it has extremely low thermal conductivity suggests these
nanowires as a promising material for future thermoelectric generation
application. (C) 2015 AIP Publishing LLC.

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