Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature dependence of anisotropic thermal conductivity tensor of
  bulk black phosphorus   To date, the intrinsic thermal conductivity tensor of bulk black phosphorus
(BP), an important 2D material, is still unknown, since recent studies focus on
BP flakes not on bulk BP. Here we report the anisotropic thermal conductivity
tensor of bulk BP, for temperature range 80 - 300 K. Our measurements are
similar to prior measurements on submicron BP flakes along zigzag and armchair
axes, but are >25% higher in the through-plane axis, suggesting that phonon
mean-free-paths are substantially longer in the through-plane direction. We
find that despite the anisotropy in thermal conductivity, phonons are
predominantly scattered by the same Umklapp processes in all directions. We
also find that the phonon relaxation time is rather isotropic in the basal
planes, but is highly anisotropic in the through-plane direction. Our work
advances fundamental knowledge of anisotropic scattering of phonons in BP and
is an important benchmark for future studies on thermal properties of BP
nanostructures.

25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph