Omer Yaniv | Searcharxiv

arXiv2026

Ferron polariton Hall effect: Deflecting optically rectified polarization with magnetic fields

Ferrons are elementary excitations of ferroelectric order that can propagate and transport polarization when excited with light. Here, we show theoretically that ferron polaritons exhibit a Hall effect: an applied magnetic field generates polarization transport perpendicular to the propagation direction of a ferron polariton excited by an incident terahertz pulse. We demonstrate this effect for the example of ferroelectric SnTe using first-principles calculations and a microscopic theory of the phonon-polariton current. The direction and magnitude of the transverse polarization transport can be controlled by the polarization of the terahertz pulse and the applied magnetic field. Our results establish a route toward light-controlled directional transport of electric polarization in ferroelectrics.

cond-mat.mtrl-sci↗

arXiv2025

Phonon polariton Hall effect

The phonon Hall effect conventionally describes the generation of a transverse heat current in an applied magnetic field. In this work, we extend the effect to hybrid light-matter excitations and demonstrate theoretically that phonon polaritons, formed by coupling optical phonons with terahertz radiation, support transverse energy flow when coherently driven in an applied magnetic field. Using the example of PbTe, which exhibits strongly coupled phonon polaritons, we show that the magnetic field splits the phonon-polariton branches into left and right-handed circular polarization, obtaining unequal group velocities. We derive the energy current operators for propagating phonon polaritons and show how their mixed phononic-photonic nature enables controllable transverse phonon-polariton transport in the terahertz regime. Our results demonstrate bending of light through a phonon polariton Hall effect, which provides a route towards terahertz polaritonic devices.

cond-mat.mtrl-sci↗

arXiv2025

Multicolor phonon excitation in terahertz cavities

Driving materials using light with more than one frequency component is an emerging technique, enabled by advanced pulse-shaping capabilities in recent years. Here, we translate this technique to lattice vibrations, by exciting multicolor phonons using terahertz cavities. In contrast to light, phonon frequencies are determined by the crystal structure and cannot readily be changed. We overcome this problem by tuning the frequencies of phonon polaritons in terahertz cavities to achieve the desired frequency ratios necessary for phononic Lissajous figures. This methodology enables dynamical crystallographic symmetry breaking and the creation of staggered phonon angular momentum and magnetic moment patterns.

cond-mat.mtrl-sci↗

arXiv2023

A quantum pseudo-integrable Hamiltonian impact system

Quantization of a toy model of a pseudointegrable Hamiltonian impact system is introduced, including EBK quantization conditions, a verification of Weyl's law, the study of their wavefunctions and a study of their energy levels properties. It is demonstrated that the energy levels statistics are similar to those of pseudointegrable billiards. Yet, here, the density of wavefunctions which concentrate on projections of classical level sets to the configuration space does not disappear at large energies, suggesting that there is no equidistribution in the configuration space in the large energy limit; this is shown analytically for some limit symmetric cases and is demonstrated numerically for some nonsymmetric cases.

nlin.CD↗

arXiv2022

Quantum pseudo-integrable Hamiltonian impact systems

Quantization of a toy model of a pseudointegrable Hamiltonian impact system is introduced, including EBK quantization conditions, a verification of Weyl's law, the study of their wavefunctions and a study of their energy levels properties. It is demonstrated that the energy levels statistics are similar to those of pseudointegrable billiards. Yet, here, the density of wavefunctions which concentrate on projections of classical level sets to the configuration space does not disappear at large energies, suggesting that there is no equidistribution in the configuration space in the large energy limit; this is shown analytically for some limit symmetric cases and is demonstrated numerically for some nonsymmetric cases.

math-ph↗