Nonlinear phonon Hall effects in ferroelectrics: its existence and non-volatile electrical control

Abstract

Nonlinear Hall effects have been previously investigated in non-centrosymmetric systems for electronic systems. However, they only exist in metallic systems and are not compatible with ferroelectrics since these latter are insulators, hence limiting their applications. On the other hand, ferroelectrics naturally break inversion symmetry and can induce a non-zero Berry curvature. Here, we show that a non-volatile electric-field control of heat current can be realized in ferroelectrics through the nonlinear phonon Hall effects. More precisely, based on Boltzmann equation under the relaxation-time approximation, we derive the equation for nonlinear phonon Hall effects, and further show that the behaviors of nonlinear phonon (Boson) Hall effects are very different from nonlinear Hall effects for electrons (Fermion). Our work provides a route for electric-field control of thermal Hall current in ferroelectrics.

arXiv comment16 pages, 2 figures

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• Non-linear Hall Effects: Mechanisms and Materials
• Probing topology in nonlinear topological materials using numerical $K$-theory
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• Lead-free room-temperature ferroelectric thermal conductivity switch using anisotropies in thermal conductivities
• Ferroelectrically Controlled Chirality Switching of Weyl Quasiparticles