Characterizing and controlling infrared phonon anomaly of bilayer graphene in optical-electrical force nanoscopy.

ABSTRACT: We, for the first time, report the nanoscopic imaging study of anomalous infrared (IR) phonon enhancement of bilayer graphene, originated from the charge imbalance between the top and bottom layers, resulting in the enhancement of E_1u mode of bilayer graphene near 0.2 eV. We modified the multifrequency atomic force microscope platform to combine photo-induced force microscope with electrostatic/Kelvin probe force microscope constituting a novel hybrid nanoscale optical-electrical force imaging system. This enables to observe a correlation between the IR response, doping level, and topographic information of the graphene layers. Through the nanoscale spectroscopic image measurements, we demonstrate that the charge imbalance at the graphene interface can be controlled by chemical

SUBMITTER: Jahng J 

PROVIDER: S-EPMC10667502 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature