Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Super-Suppression of Long Phonon Mean-Free-Paths in Nano-engineered Si
  due to Heat Current Anticorrelations   The ability to minimize the thermal conductivity of dielectric materials with
a minimal structural intervention that could affect electrical properties is an
important tool for engineering good thermoelectric efficiency in low-cost
semiconductor materials such as Si. Special arrangements for pores in
nanoporous Si have been recently identified in our previous work to produce a
particularly large reduction in thermal conductivity accompanied by strongly
anticorrelated heat current fluctuations. This manuscript presents the results
of molecular dynamics simulations and a Monte Carlo ray-tracing model that
further teases apart this phenomenon to reveal how the special pore layouts
produce correlated scattering of the heat-carrying phonons. This means that
heat carried by a phonon before scattering is undone by the scattered phonon,
resulting in an effective mean-free-path which is significantly shorter than
the distance that the phonons travel between the pores. This effect is
particularly noticeable for the long wavelength, long mean-free-path phonons
whose transport is impeded drastically more than what expected purely from the
usual considerations of scattering defined by the distance between defects.
This super suppression of the mean-free-path below the characteristic scale of
the nanostructuring offers a route for minimizing thermal conductivity with
minimal structural impact, while the stronger impact on long wavelengths offer
possibilities for the design of `band-pass' phonon filtering. Moreover, the
ray-tracing model developed in this paper shows that different forms of
correlated scattering imprint a unique signature in the heat current
autocorrelation function that could be used as a diagnostic in other
nanostructured systems.

30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph