Valley transport driven by dynamic lattice distortion

TL;DR

This paper presents a theoretical study on how dynamic lattice distortions in 2D Dirac materials can control valley transport and angular momentum conversion, enabling mechanical manipulation of valley degrees of freedom.

Contribution

It introduces a formalism linking lattice vorticity and valley dynamics, incorporating strain effects, and predicts controllable valley transport phenomena.

Findings

Valley transfer and localization due to dynamic lattice distortions

Transport properties can be tuned to switch between insulating and conducting states

Generation of pulsed charge currents through mechanical manipulation

Abstract

Angular momentum conversion between mechanical rotation and the valley degree of freedom in 2D Dirac materials is investigated theoretically. Coupling between the valley and vorticity of dynamic lattice distortions is derived by applying the k.p method to 2D Dirac materials with an inertial effect. Lattice strain effects are also incorporated. Valley transfer and valley-dependent carrier localization are predicted using the dynamic lattice distortions. The transport properties are found to be controllable, allowing the system to be insulating and to generate pulsed charge current. Our formalism offers a route toward mechanical manipulation of valley dynamics in 2D Dirac materials.