Single spin localization and manipulation in graphene open-shell nanostructures.

Abstract:

:Turning graphene magnetic is a promising challenge to make it an active material for spintronics. Predictions state that graphene structures with specific shapes can spontaneously develop magnetism driven by Coulomb repulsion of π-electrons, but its experimental verification is demanding. Here, we report on the observation and manipulation of individual magnetic moments in graphene open-shell nanostructures on a gold surface. Using scanning tunneling spectroscopy, we detect the presence of single electron spins localized around certain zigzag sites of the carbon backbone via the Kondo effect. We find near-by spins coupled into a singlet ground state and quantify their exchange interaction via singlet-triplet inelastic electron excitations. Theoretical simulations picture how electron correlations result in spin-polarized radical states with the experimentally observed spatial distributions. Extra hydrogen atoms bound to radical sites quench their magnetic moment and switch the spin of the nanostructure in half-integer amounts. Our work demonstrates the intrinsic π-paramagnetism of graphene nanostructures.

journal_name

Nat Commun

journal_title

Nature communications

authors

Li J,Sanz S,Corso M,Choi DJ,Peña D,Frederiksen T,Pascual JI

doi

10.1038/s41467-018-08060-6

subject

Has Abstract

pub_date

2019-01-14 00:00:00

pages

200

issue

1

issn

2041-1723

pii

10.1038/s41467-018-08060-6

journal_volume

10

pub_type

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