Optical control of edge chirality in graphene

Milan Begliarbekov, Ken Ichi Sasaki, Onejae Sul, Eui Hyeok Yang, Stefan Strauf

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We performed optical annealing experiments at the edges of nanopatterned graphene to study the resultant edge reconstruction. The lithographic patterning direction was orthogonal to a zigzag edge. μ-Raman spectroscopy shows an increase in the polarization contrast of the G band as a function of annealing time. Furthermore, transport measurements reveal a 50% increase of the GNR energy gap after optical exposure, consistent with an increased percentage of armchair segments. These results suggest that edge chirality of graphene devices can be optically purified post electron beam lithography, thereby enabling the realization of chiral graphene nanoribbons and heterostructures.

Original languageEnglish
Pages (from-to)4874-4878
Number of pages5
JournalNano Letters
Volume11
Issue number11
DOIs
StatePublished - 9 Nov 2011

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