Phonon chirality manipulation mechanism in TMD interlayer-sliding ferroelectrics

TL;DR

This paper explores how interlayer sliding in transition-metal dichalcogenide ferroelectrics can control phonon chirality, affecting properties like Berry curvature, angular momentum, and the phonon Hall effect, with implications for chiral phonon studies.

Contribution

It introduces a novel mechanism using interlayer sliding to manipulate phonon chirality in TMD ferroelectrics, supported by first-principles calculations.

Findings

Sliding regulates phonon chirality and Berry curvature.

Manipulation affects phonon angular momentum and magnetization.

Influences phonon Hall effect under magnetic fields.

Abstract

As an ideal platform, both the theoretical prediction and first experimental verification of chiral phonons are based on transition-metal dichalcogenide materials. The manipulation of phonon chirality in these materials will have a profound impact on the study of chiral phonons. In this work, we utilize the sliding ferroelectric mechanism to study the phonon chirality manipulation mechanism in transition-metal dichalcogenide materials. Based on first-principles calculations, we study the different effects of interlayer sliding on the phonon properties in bilayer and four-layer MoS$_2$ sliding ferroelectrics. We find that sliding can regulate phonon chirality and Berry curvature, which further affects the phonon angular momentum and magnetization under a temperature gradient and the phonon Hall effect under a magnetic field. Our work connects two emerging fields and opens up a new route to manipulate phonon chirality in transition-metal dichalcogenide materials through the sliding ferroelectric mechanism.