Giant edge state splitting at atomically precise graphene zigzag edges

Wang, Shiyong; Talirz, Leopold; Pignedoli, Carlo A.; Feng, Xinliang; Müllen, Klaus; Fasel, Roman; Ruffieux, Pascal (2016). Giant edge state splitting at atomically precise graphene zigzag edges. Nature communications, 7, p. 11507. Nature Publishing Group 10.1038/ncomms11507

[img]
Preview
Text
ncomms11507.pdf - Published Version
Available under License Creative Commons: Attribution (CC-BY).

Download (955kB) | Preview

Zigzag edges of graphene nanostructures host localized electronic states that are predicted to be spin-polarized. However, these edge states are highly susceptible to edge roughness and interaction with a supporting substrate, complicating the study of their intrinsic electronic and magnetic structure. Here, we focus on atomically precise graphene nanoribbons whose two short zigzag edges host exactly one localized electron each. Using the tip of a scanning tunnelling microscope, the graphene nanoribbons are transferred from the metallic growth substrate onto insulating islands of NaCl in order to decouple their electronic structure from the metal. The absence of charge transfer and hybridization with the substrate is confirmed by scanning tunnelling spectroscopy, which reveals a pair of occupied/unoccupied edge states. Their large energy splitting of 1.9 eV is in accordance with ab initio many-body perturbation theory calculations and reflects the dominant role of electron–electron interactions in these localized states.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Fasel, Roman

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry
500 Science > 530 Physics

ISSN:

2041-1723

Publisher:

Nature Publishing Group

Language:

English

Submitter:

Roman Fasel

Date Deposited:

05 Jan 2017 14:30

Last Modified:

08 Jan 2017 07:04

Publisher DOI:

10.1038/ncomms11507

PubMed ID:

27181701

BORIS DOI:

10.7892/boris.90588

URI:

https://boris.unibe.ch/id/eprint/90588

Actions (login required)

Edit item Edit item
Provide Feedback