Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Giant thermoelectric effect in graphene-based topological insulators
  with nanopores   Designing thermoelectric materials with high figure of merit $ZT=S^2 G
T/\kappa$ requires fulfilling three often irreconcilable conditions, i.e., the
high electrical conductance $G$, small thermal conductance $\kappa$ and high
Seebeck coefficient $S$. Nanostructuring is one of the promising ways to
achieve this goal as it can substantially suppress lattice contribution to
$\kappa$. However, it may also unfavorably influence the electronic transport
in an uncontrollable way. Here we theoretically demonstrate that this issue can
be ideally solved by fabricating graphene nanoribbons with heavy adatoms and
nanopores. These systems, acting as a two-dimensional topological insulator
with robust helical edge states carrying electrical current, yield a highly
optimized power factor $S^2G$ per helical conducting channel. Concurrently,
their array of nanopores impedes the lattice thermal conduction through the
bulk. Using quantum transport simulations coupled with first-principles
electronic and phononic band structure calculations, the thermoelectric figure
of merit is found to reach its maximum $ZT \simeq 3$ at $T \simeq 40$ K. This
paves a way to design high-$ZT$ materials by exploiting the nontrivial topology
of electronic states through nanostructuring.

15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs