Stacking dependence of carrier-interactions in multilayer graphene systems

TL;DR

This paper investigates how the stacking sequence in multilayer graphene affects carrier interactions, revealing systematic variations in electronic properties through a new theoretical approach that emphasizes momentum-direction dependent phases.

Contribution

It introduces a novel method to analyze stacking-dependent carrier interactions in multilayer graphene, highlighting the role of intersite phases in electronic phenomena.

Findings

Stacking sequence significantly influences carrier interaction phenomena.

Theoretical calculations of self-energies and response functions vary systematically with stacking.

Electron-electron interactions impact electronic properties through a balance of exchange and correlation effects.

Abstract

We identify qualitative trends in the stacking sequence dependence of carrier-carrier interaction phenomena in multilayer graphene. Our theory is based on a new approach which explicitly exhibits the important role in interaction phenomena of the momentum-direction dependent intersite phases determined by the stacking sequence. Using this method, we calculate and compare the self-energies, density--density response functions, collective modes, and ground-state energies of several different few layer graphene systems. The influence of electron--electron interactions on important electronic properties can be understood in terms of competition between intraband exchange, interband exchange and correlation contributions that vary systematically with stacking arrangement.