Strain-driven chiral phonons in two-dimensional hexagonal materials

TL;DR

This paper demonstrates how applying uniaxial strain to hexagonal 2D materials can generate and control new chiral phonon modes near the Brillouin zone center, expanding the possibilities for quantum property engineering.

Contribution

It introduces a method to induce and manipulate strain-driven chiral phonons in 2D hexagonal materials, overcoming previous symmetry constraints.

Findings

Strain induces new chiral phonons near the zone center.

Strain controls the position of chiral modes in the Brillouin Zone.

New technique for engineering quantum properties of 2D lattices.

Abstract

Hexagonal two-dimensional materials with broken inversion symmetry (as BN or transition metal dichalcodenides) are known to sustain chiral phonons with finite angular momentum, adding a further useful degree of freedom to the extraordinary entangled (electrical, optical, magnetic and mechanical) properties of these compounds. However, because of lattice symmetry constraints, such chiral modes are constrained to the corners of the Brillouin zone, allowing little freedom for manipulating the chiral features. In this work, we show how the application of uniaxial strain leads to the existence of new chiral modes in the vicinity of the zone center. We also show that such strain-induced chiral modes, unlike the ones pinned at the K points, can be efficiently manipulated by modifying the strain itself, which determines the position of these modes in the Brillouin Zone. The results of the present paper add a new technique for the engineering of the quantum properties of two-dimensional lattices.