Enhancement of the Na$_x$CoO$_2$ thermopower due to electronic correlations

Details Enhancement of the Na$_x$CoO$_2$ thermopower due to electronic correlations Enhancement of the Na$_x$CoO$_2$ thermopower due to electronic correlations

2011-04-11

arxiv.org/abs/1104.1928v1

Phys. Rev. B 82, 201106(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.82.201106

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.

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