Gate-tunable optical extinction of graphene nanoribbon nanoclusters

Erin Sheridan,Mamun Sarker,Ki-Tae Eom,Alexander Sinitskii,Jeremy Levy,Patrick Irvin,Gang Li,Shan Hao,Chang-Beom Eom

doi:10.1063/5.0048795

Abstract

We investigate the optical response of graphene nanoribbons (GNRs) using the broadband nonlinear generation and detection capabilities of nanoscale junctions created at the LaAlO3/SrTiO3 interface. GNR nanoclusters measured to be as small as 1–2 GNRs in size are deposited on the LaAlO3 surface with an atomic force microscope tip. Time-resolved nonlinear optical probes of GNR nanoclusters reveal a strong, gate-tunable second and third harmonic response, as well as strong extinction of visible to near-infrared light at distinct wavelengths, similar to previous reports with graphene.

Highlights

Graphene nanoribbons (GNRs), quasi-one-dimensional honeycomb arrangements of carbon with precisely defined chemical makeup defined by synthetic chemistry, have emerged as a system of interest in low-dimensional condensed matter physics
We investigate the optical response of graphene nanoribbons (GNRs) using the broadband nonlinear generation and detection capabilities of nanoscale junctions created at the LaAlO3/SrTiO3 interface
The integrated amplitude of the DFG (0–100 THz) response is correlated with the LNR (300–450 THz) response, while the second harmonic generation (SHG) (675–850 THz) response is correlated with the third harmonic generation (THG) (1050–1250 THz) response

Summary

Introduction

Graphene nanoribbons (GNRs), quasi-one-dimensional honeycomb arrangements of carbon with precisely defined chemical makeup defined by synthetic chemistry, have emerged as a system of interest in low-dimensional condensed matter physics. On account of their high electronic mobility, high thermal conductivity, and low noise, they are candidates for use in next-generation integrated circuits and other systems.. Unlike pristine two-dimensional graphene sheets, GNRs often have energy bandgaps; their electronic structure depends sensitively on their width, edge geometry, and dopants.. Unlike pristine two-dimensional graphene sheets, GNRs often have energy bandgaps; their electronic structure depends sensitively on their width, edge geometry, and dopants.9–12 This allows for atomic-scale engineering of diverse physical properties.. Characterizing and integrating a small number of GNRs is necessary, as aggregation effects obscure their intrinsic properties, and precise control is required for quantum applications.

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