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MA: Fachverband Magnetismus

MA 40: Focus Session: Chiral phonons and crystals coupled to magnetic order II

MA 40.3: Vortrag

Donnerstag, 12. März 2026, 10:15–10:30, HSZ/0002

Universal phonon angular momentum Hall effect — •Daniel Bustamante Lopez^1,2, Verena Brehm², and Dominik Juraschek² — ¹Boston University, Boston, MA, USA — ²Eindhoven University of Technology, Eindhoven, Netherlands

The phonon angular momentum Hall effect was recently proposed as a phononic analogue of the spin and orbital Hall effects. Here, we demonstrate that a temperature gradient universally drives a transverse flow of phonon angular momentum in harmonic lattices. Using an exact Green's function method together with nonequilibrium molecular dynamics, we obtain closed-form expressions for the local phonon angular momentum density, bond-resolved current, and a corresponding conductivity kernel that ties them to spatial temperature variations. The Hall response originates from bath-induced mode mixing encoded in off-diagonal phonon correlations and does not require lattice chirality, Berry curvature, or inversion-symmetry breaking. It persists in the most simple centrosymmetric geometries, including square and honeycomb lattices. We predict robust edge accumulation and a tunable Hall angle for phonon angular momentum in various materials with quantitative agreement between analytic theory and simulations. Our results establish the phonon angular momentum Hall effect as a universal channel for transverse angular-momentum transport in crystalline solids.

Keywords: chiral phonons; Hall effect; phononics; Green's function; phonon angular momentum