Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reduction of phonon mean free path: from low temperature physics to room
  temperature applications in thermoelectricity   It has been proposed for a long time now that the reduction of the thermal
conductivity by reducing the phonon mean free path is one of the best way to
improve the current performance of thermoelectrics. By measuring the thermal
conductance and thermal conductivity of nanowires and thin films, we show
different ways of increasing the phonon scattering from low temperature up to
room temperature experiments. It is shown that playing with the geometry
(constriction, periodic structures, nano-inclusions), from the ballistic to the
diffusive limit, the phonon thermal transport can be severely altered in single
crystalline semiconducting structures; the phonon mean free path being in
consequence reduced. The diverse implications on thermoelectric properties will
be eventually discussed.

33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex