Dynamical polarization in ABC-stacked multilayer graphene in a magnetic field

TL;DR

This paper calculates the dynamical polarization functions in ABC-stacked multilayer graphene under a magnetic field, providing analytic expressions and numerical results for Coulomb interactions considering various physical parameters.

Contribution

It presents new analytic formulas for polarization functions in multilayer graphene in magnetic fields, including effects of chemical potential, temperature, and Landau level broadening.

Findings

Analytic expressions for polarization functions derived in terms of special functions.

Numerical calculations of Coulomb potentials as functions of momentum and frequency.

Discussion of various physical limits such as static and clean cases.

Abstract

In the continuum low energy model, we calculate the one-loop dynamical polarization functions in ABC-stacked (rhombohedral) $n$-layer graphene in a magnetic field. Neglecting the trigonal warping effects, they are derived as functions of wavevector and frequency at finite chemical potential, temperature, band gap, and the width of Landau levels. The analytic results are given in terms of digamma functions and generalized Laguerre polynomials and have the form of double sums over Landau levels. Various particular limits for polarization functions (static, clean, etc.) are discussed. The intralayer and interlayer screened Coulomb potentials are numerically calculated as functions of momentum and frequency.