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arXiv · 1905.11039

Quantum thermoelectrics based on 2-D Semi-Dirac materials

Alestin Mawrie·Bhaskaran Muralidharan
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Abstract

We show that a gap parameter can fully describe the merging of Dirac cones in semi-Dirac materials from $K$- and $K^\prime$-points into the common $M$-point in the Brillouin zone. We predict that the gap parameter manifests itself by enhancing the thermoelectric figure of merit $zT$ as the chemical potential crosses the gap followed by a sign change in the Seebeck coefficient around the same point. Subsequently, we show that there is also a trade-off feature between the maximum power delivered and the efficiency when the chemical potential crosses the gap parameter. An optimal operating point that minimizes the power-efficiency trade-off is consequently singled out for the best thermoelectric performance. Our work paves the way for the use of 2D semi-Dirac materials for thermoelectric applications.

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Alestin Mawrie, Bhaskaran Muralidharan. 2019-08-08. Quantum thermoelectrics based on 2-D Semi-Dirac materials. https://doi.org/10.1103/physrevb.100.081403

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