Quantum mechanics

Electrical resistivity and conductivity

Context (archaeology)

Biology

Thermal Hall effect

Metallurgy

Materials science

Thermal conductivity

Coupling (piping)

Phonon

Ferroelectricity

Mean free path

Paleontology

Thermodynamics

Physics

Dielectric

Coupling constant

Thermal

Condensed matter physics

Composite material

Electron

Hall effect

Optoelectronics

Physical Review Letters

In the context of recent experimental observations of an unexpectedly large thermal Hall conductivity, κ_{H}, in insulating La_{2}CuO_{4} (LCO) and SrTiO_{3} (STO), we theoretically explore conditions under which acoustic phonons can give rise to such a large κ_{H}. Both the intrinsic and extrinsic contributions to κ_{H} are large in proportion to the dielectric constant, ε, and the "flexoelectric" coupling, F. While the intrinsic contribution is still orders of magnitude smaller than the observed effect, an extrinsic contribution proportional to the phonon mean-free path appears likely to account for the observations, at least in STO. We predict a larger intrinsic κ_{H} in certain insulating perovskites.

Enhanced Thermal Hall Effect in Nearly Ferroelectric Insulators