Analysis the neutral triplet collective mode in honeycomb lattice: without one-cone approximation

TL;DR

This paper investigates the existence of a neutral triplet collective mode in undoped graphene and graphite without relying on the one-cone approximation, examining the effects of Hubbard interactions and long-range interactions.

Contribution

It provides a detailed analysis of the neutral triplet collective mode in honeycomb lattices without the one-cone approximation, considering different interaction representations.

Findings

Short and long-range interactions do not induce the neutral triplet mode in this context.

The study offers insights into the role of Hubbard interactions in honeycomb lattice collective modes.

It challenges previous assumptions based on the one-cone approximation.

Abstract

In this research has been studied the possibility of existence the neutral triplet collective mode in undoped graphene and graphite without one-cone approximation. This work tries to study this collective mode from different points of view. It also studies the effects of on-site Hubbard interaction on neutral collective mode in honeycomb lattice via two representations (sub-lattice and eigenvector). The effective long rang interaction in honeycomb lattice has been introduced for studying the spin collective mode. This work shows that short and effective long range interactions are not responsible for the formation of neutral triplet collective mode in graphene without {\it one-cone} approximation.