Quantum thermoelectrics based on 2-D Semi-Dirac materials

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.

arXiv comment5 pages, 5 figures

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Cited by in corpus (9)

• Manifestation of the thermoelectric properties in Ge-based halide perovskites
• Valley caloritronics in a photodriven hetero-junction of Dirac materials
• Topological phase transition induced by band structure modulation in a Chern insulator
• Thermoelectric transport of type-I, II, and III massless Dirac fermions in two-dimensional lattice model
• Topological chiral interface states beyond insulators
• Anisotropic and tunable optical conductivity of a two-dimensional semi-Dirac system in the presence of elliptically polarized radiation
• Proposal for a graphene based nano-electro-mechanical reference piezoresistor
• Electrical and thermal transport through $\alpha -T_3$ NIS junction
• Interacting type-II semi-Dirac quasiparticles