Intrinsic Contribution to Non-linear Thermoelectric Effect

Abstract

Irradiation of the strong light on the material leads to numerous non-linear effects that are essential to understand the physics of excited states of the system and for optoelectronics. Here, we study the non-linear thermoelectric effect due to the electric and thermal fields applied on a non-centrosymmetric system. The phenomenon arises on the Fermi surface with the transitions of electrons from valence to conduction bands. We derive the formlism to investigate these effects and find that the non-linearity in these effects namely non-linear Seebeck and non-linear Peltier effects depends on the ratio of the non-linear to the linear conductivities. The theory is tested for a hexagonally warped and gapped topological insulator. Results show enhancement in the longitudinal and Hall effects on increasing the warping strength while show opposite behavior with the surface gap.

8 pages

References in corpus (11)

• Topological response in Weyl semimetals and the chiral anomaly
• Weyl Semimetals, Fermi Arcs and Chiral Anomalies (A Short Review)
• Semiclassical theory of nonlinear magneto-optical responses with applications to topological Dirac/Weyl semimetals
• Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
• Shift charge and spin photocurrents in Dirac surface states of topological insulator
• Negative magnetoresistance due to conductivity fluctuations in films of the topological semimetal Cd3As2
• Second-order nonlinear optical response of graphene
• Resonant photovoltaic effect in doped magnetic semiconductors
• Nonlinear spin-thermoelectric transport in two-dimensional topological insulators
• Thermoelectric Effects and Topological Insulators
• Enhanced photogalvanic effect in graphene due to Rashba spin-orbit coupling