Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermoelectric power factor of nanocomposite materials from
  two-dimensional quantum transport simulations   Nanocomposites are promising candidates for the next generation of
thermoelectric materials since they exhibit extremely low thermal
conductivities as a result of phonon scattering on the boundaries of the
various material phases. The nanoinclusions, however, should not degrade the
thermoelectric power factor, and ideally should increase it, so that benefits
to the ZT figure of merit can be achieved. In this work we employ the
Non-Equilibrium Greens Function (NEGF) quantum transport method to calculate
the electronic and thermoelectric coefficients of materials embedded with
nanoinclusions. For computational effectiveness we consider two-dimensional
nanoribbon geometries, however, the method includes the details of geometry,
electron-phonon interactions, quantisation, tunneling, and the ballistic to
diffusive nature of transport, all combined in a unified approach. This makes
it a convenient and accurate way to understand electronic and thermoelectric
transport in nanomaterials, beyond semiclassical approximations, and beyond
approximations that deal with the complexities of the geometry. We show that
the presence of nanoinclusions within a matrix material offers opportunities
for only weak energy filtering, significantly lower in comparison to
superlattices, and thus only moderate power factor improvements. However, we
describe how such nanocomposites can be optimised to limit degradation in the
thermoelectric power factor and elaborate on the conditions that achieve the
aforementioned mild improvements. Importantly, we show that under certain
conditions, the power factor is independent of the density of nanoinclusions,
meaning that materials with large nanoinclusion densities which provide very
low thermal conductivities, can also retain large power factors and result in
large ZT figures of merit.

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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: nucl-ex