Effect of Inter-Adatoms Correlations on the Local Density of States of Graphene

TL;DR

This paper theoretically investigates how correlations between two distant adatoms affect the local density of states in graphene, revealing multilevel structures and beating patterns near the Dirac points, with implications for STM conductance experiments.

Contribution

It introduces a theoretical model showing novel LDOS features caused by inter-adatom correlations in graphene, which can be observed via STM.

Findings

Multilevel structures in LDOS near Dirac points

Beating patterns in the induced LDOS

Anisotropic effects in LDOS due to adatom correlations

Abstract

We discuss theoretically the local density of states (LDOS) of a graphene sheet hosting two distant adatoms located at the center of the hexagonal cells. By putting laterally a Scanning Tunneling Microscope (STM) tip over a carbon atom, two remarkable novel effects can be detected: i) a multilevel structure in the LDOS and ii) beating patterns in the induced LDOS. We show that both phenomena occur nearby the Dirac points and are highly anisotropic. Furthermore, we propose conductance experiments employing STM as a probe for the observation of such exotic manifestations in the LDOS of graphene induced by inter-adatoms correlations.