Current orderings of interacting electrons in bilayer graphene

TL;DR

This paper develops an eight-band model for interacting electrons in bilayer graphene, showing that only same-sublattice current orderings are physically feasible, supporting a spin-polarized-current ground state that explains experimental observations.

Contribution

It introduces a comprehensive eight-band model considering all current orderings and confirms the spin-polarized-current phase as the ground state in bilayer graphene.

Findings

Only same-sublattice current orderings are possible within physical interaction strengths.

The model supports a spin-polarized-current phase as the ground state.

Resolves experimental puzzles related to electron interactions in bilayer graphene.

Abstract

By taking into account the possibility of all the intralayer as well as the interlayer current orderings, we derive an eight-band model for interacting electrons in bilayer graphene. With the numerical solution to the model, we show that only the current orderings between the same sublattice sites can exist within the range of the physical interacting strength. This result confirms our previous model of spin-polarized-current phase for the ground-state of interacting electrons in bilayer graphene that resolves a number of experimental puzzles.