Renormalization and cyclotron resonance in bilayer graphene with weak electron-hole asymmetry

TL;DR

This paper investigates how weak electron-hole asymmetry affects cyclotron resonance in bilayer graphene, demonstrating the theory's renormalizability and the impact on the velocity factor's behavior under magnetic fields.

Contribution

It presents a renormalization framework for bilayer graphene with electron-hole asymmetry and shows how this improves agreement with experimental data.

Findings

Theory remains renormalizable to O(e^2) with asymmetry

Electron-hole asymmetry improves data fit

Renormalized velocity runs with magnetic field

Abstract

Cyclotron resonance in bilayer graphene is studied with weak electron-hole asymmetry, suggested by experiment, taken into account and with the focus on many-body corrections that evade Kohn's theorem. It is shown by direct calculation that the theory remains renormalizable to O(e^2) in the presence of electron-hole asymmetry parameters, and a general program to carry out renormalization for graphene under a magnetic field is presented. Inclusion of electron-hole asymmetry in part improves the theoretical fit to the existing data and the data appear to indicate the running of the renormalized velocity factor with the magnetic field, which is a key consequence of renormalization.