Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Incoherent phonon transport dominates heat conduction across van der
  Waals superlattices   Heat conduction mechanisms in superlattices could be different across
different types of interfaces. Van der Waals superlattices are structures
physically assembled through weak van der Waals interactions by design, and may
host properties beyond the traditional limits of lattice matching and
processing compatibility, offering new types of interfaces. In this work,
natural van der Waals (SnS)1.17(NbS2)n superlattices are synthesized, and their
thermal conductivities are measured by time-domain thermoreflectance as a
function of interface density. Our results show that heat conduction of
(SnS)1.17(NbS2)n superlattices is dominated by interface scattering when the
coherent length of phonons is larger than the superlattice period, indicating
incoherent phonon transport dominates cross-plane heat conduction in van der
Waals superlattices even when the period is atomically thin and abrupt.
Moreover, our result suggests that the widely accepted heat conduction
mechanism for conventional superlattices that coherent phonons dominate when
the period is short, is not applicable due to symmetry breaking in most van der
Waals superlattices. Our findings provide new insight for understanding the
thermal behavior of van der Waals superlattices, and devise approaches for
effective thermal management of superlattices depending on the distinct types
of interfaces.

32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th