Nanoscale THz Spectroscopy of Electrically Gated Graphene Nanoribbons

Graphene nanoribbons (GNRs) have shown many interesting electrical and optical properties. We have developed a novel optical spectrometer capable of probing the nonlinear optical response of nanoparticles with dimensions ~10 nm or less, over a wide range of frequencies in THz and near-infrared [1]. The experiments take advantage of strong nonlinearities in SrTiO3 and the ability to “write” conductive nanowires at the LaAlO3/SrTiO3 (LAO/STO) interface, with ~10 nm gaps that are co-located with a GNR. We will probe GNRs individually under the influence of large electric fields (~1 MV/cm) with various geometries of electric gates that are both static and dynamic.



[1] - L. Chen, et al., Light: Science & Appl. 8, 24 (2019).