Role played by strain on Plasmons, screening and energy loss in Graphene/substrate contacts

TL;DR

This paper investigates how mechanical strain affects plasmons, screening, and energy loss in graphene/substrate contacts, combining theoretical and numerical methods to analyze strain-dependent plasmon behavior and energy dissipation.

Contribution

It introduces a comprehensive theoretical framework for understanding strain effects on plasmons and energy loss in graphene-based layered structures.

Findings

Plasmon frequency depends on strain magnitude and direction.

Strain influences charge screening effectiveness.

Energy loss rates vary with strain and substrate interactions.

Abstract

The combined effect due to mechanical strain, coupling to the plasmons in a doped conducting substrate, the plasmon-phonon scattering in conjunction with the role played by encapsulation of a secondary two-dimensional (2D) layer is investigated both theoretically and numerically. The calculations are based on the random-phase approximation (RPA) for the surface response function which yields the plasmon dispersion equation that is applicable in the presence or absence of an applied uniaxial strain. We present results showing the dependence of the frequency of the charge density oscillations on the strain modulus and direction of the wave vector in the Brillouin zone. The shielding of a dilute distribution of charges as well as the rate of loss of energy for impinging charges is investigated for this hybrid layered structure.