Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heat guiding and focusing using ballistic phonon transport in phononic
  nanostructures   Unlike classical heat diffusion at the macroscale, nanoscale heat transport
can occur without energy dissipation because phonons can travel in straight
lines for hundreds of nanometres. Despite recent experimental evidence of such
ballistic phonon transport, control over its directionality, and thus its
practical use, remains a challenge, as the directions of individual phonons are
chaotic. Here, we show a way to control the directionality of ballistic phonon
transport using silicon thin-films with arrays of holes. First, we demonstrate
the formation of directional heat fluxes in the passages between the holes.
Next, we use these nanostructures as a directional source of ballistic phonons
and couple the emitted phonons into nanowires. Finally, we introduce a
nanoscale thermal lens in which the phonons converge at a focal point, thus
focusing heat into a spot of a few hundred nanometres. These results provide a
basis for ray-like heat manipulations that enable nanoscale heat guiding,
dissipation, localization, confinement and rectification.

37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph