Nonlinear response induced by Ferromagnetism in a Noncentrosymmetric Kondo Lattice system

Recently, nonlinear response has been actively studied in noncetrosymmeric systems. Previous studies has focused on noninteracting systems and showed a second order conductivity reflects on the inversion breaking structures or topological nature. On the other hand, strongly correlated system is also interesting platform. S. Dzsaber et.al. [1] have experimentally observed a giant nonlinear Hall response in a Kondo system Ce₃Bi₄Pd₃. This hugeness of the nonlinear conductivity is explained theoretically by the renormalization effect [2].

In this work [3], we treat with other correlation effects, ferromagnetism and Kondo effect. We analyze the nonlinear conductivity in a noncentrosymmetric Kondo lattice system with Rashba type spin-orbit coupling. We mainly focus on the ferromagnetic phase, in which the second-order nonlinear conductivity becomes finite. Remarkably, we find that the second-order conductivity has a strong spin dependence due to spin-selective Kondo insulator. Finally, we analyze sign changes in the nonlinear conductivity, which can be explained by a combination of correlation effects and the energetic shift due to the occurring ferromagnetism and Kondo effect.

[1] S. Dzsaber et.al., PNAS 118, 10.1073/pnas.2013386118

[2] A. Kofuj et.al., PRB 104, 085151

[3] K.S. and R. Peters, arxiv:2110.10496