Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 56: Focus Session: (Anti)ferroic states – Magnetic and magnetoelectric III (joint session FM/MA)

MA 56.3: Talk

Friday, March 13, 2026, 10:15–10:30, BEY/0E40

Nonlinear phononic slidetronics — •Pooja Rani and Dominik Juraschek — Eindhoven University of Technology, Eindhoven, Netherlands

We investigate ultrafast switching of ferroelectricity in bilayer hexagonal boron nitride using nonlinearly driven phonons. Conventional coherent phonon excitation mechanisms such as infrared absorption, Raman-based techniques, and terahertz sum-frequency excitation produce too small a shear-mode amplitude to overcome the barrier between stacking orders. Using first-principles calculations and phenomenological modeling, we demonstrate instead that strong excitation of high-frequency intralayer phonons dynamically tilts the interlayer potential, enabling efficient and deterministic switching at experimentally accessible pulse strengths. Our results establish nonlinear phononic slidetronics as a powerful method for ultrafast, energy-efficient control of stacking order and related electronic phases in van der Waals materials, with potential for future all-optical ferroelectric memory devices.

Keywords: Ultrafast; Interlayer ferroelectricity; shear phonon; Phononic; slidetronics