Monitoring Electrostatically-Induced Deflection, Strain and Doping in Suspended Graphene using Raman Spectroscopy
arXiv:1608.05643 · doi:10.1088/2053-1583/4/1/014004
Abstract
Electrostatic gating offers elegant ways to simultaneously strain and dope atomically thin membranes. Here, we report on a detailed \textit{in situ} Raman scattering study on graphene, suspended over a Si/SiO substrate. In such a layered structure, the intensity of the Raman G- and 2D-mode features of graphene are strongly modulated by optical interference effects and allow an accurate determination of the electrostatically-induced membrane deflection, up to irreversible collapse. The membrane deflection is successfully described by an electromechanical model, which we also use to provide useful guidelines for device engineering. In addition, electrostatically-induced tensile strain is determined by examining the softening of the Raman features. Due to a small residual charge inhomogeneity , we find that non-adiabatic anomalous phonon softening is negligible compared to strain-induced phonon softening. These results open perspectives for innovative Raman scattering-based readout schemes in two-dimensional nanoreso
References in corpus (21)
- Ultrahigh electron mobility in suspended graphene
- Suspended Graphene: a bridge to the Dirac point
- Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation
- Ripple Texturing of Suspended Graphene Atomic Membranes
- A tunable carbon nanotube electromechanical oscillator
- Electric Field Effect Tuning of Electron-Phonon Coupling in Graphene
- Optical Separation of Mechanical Strain from Charge Doping in Graphene
- Negative Thermal Expansion Coefficient of Graphene Measured by Raman Spectroscopy
- Rayleigh Imaging of Graphene and Graphene Layers
- Non-adiabatic Kohn-anomaly in a doped graphene monolayer
- Probing the Intrinsic Properties of Exfoliated Graphene: Raman Spectroscopy of Free-Standing Monolayers
- Phonon anharmonicities in graphite and graphene
- Young's modulus of Graphene: a molecular dynamics study
- Interference effect on Raman spectrum of graphene on SiO_2/Si
- Theory of resonant multiphonon Raman scattering in graphene
- Dynamical strong coupling and parametric amplification in mechanical modes of graphene drums
- Observation of Anomalous Phonon Softening in Bilayer Graphene
- Local Optical Probe of Motion and Stress in a multilayer graphene NEMS
- All-Optical Blister Test of Suspended Graphene Using Micro-Raman Spectroscopy
- Landau level spectroscopy of electron-electron interactions in graphene
- Suspended Monolayer Graphene under True Uniaxial Deformation