  The structural and thermal properties of bulk Td-WTe2 have been studied by
using first-principles calculations. We find that the lattice thermal
conductivity of WTe2 is anisotropic, with the highest value along a-axis and
lowest one along the c-axis at 300 K. Our calculated size dependent thermal
conductivity shows that nanostructuring of WTe2 can possibly further decrease
the lattice thermal conductivity. Such extremely low thermal conductivity, even
much lower than WSe2, makes WTe2 attractive for use as thermal-insulation
material for thermoelectric devices.
