Nano-manipulation and laser treatment as alternative routes for strain engineering in Graphene

Abstract

Abstract In this work we present two alternative routes for strain engineering in graphene. The first technique involves a laser treatment a low power that was found to create micro-bubbles on single layer graphene flakes. The effect of strain and doping of the graphene along these micro-bubbles is mapped and analysed using Raman Spectroscopy and it is found that a pronounced split in the G-band phonon mode can be attributed to large strain induction. The second technique discussed involves the use of nano-manipulating probes to manoeuvre and deform multilayer graphene flakes. Devices fabricated from such deformed flakes exhibit transport deviating from the expected 2D/quasi-2D electron gas observed in single layer graphene and graphite. We observe signatures of quantum linear magnetoresistance up to large fields in such devices.