Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhancement of the Na$_x$CoO$_2$ thermopower due to electronic
  correlations   Using the merger of local density approximation and dynamical mean field
theory, we show how electronic correlations increase the thermopower of
Na$_{0.7}$CoO$_2$ by 200%. The newly revealed mechanism is an asymmetric shift
of (quasi) electrons and holes away from the Fermi level, concurrent with an
asymmetry of the respective (group) velocities. Exploiting this effect in
bandstructure and correlation engineering may lead to a substantial increase of
the thermoelectric figure of merit.

15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph