2012/05/31 by Andres Castellanos-Gomez, Andrés Castellanos-Gómez, H. B. Meerwaldt +4 · 68 citations
Engineering · Physics and Astronomy · #Carbon nanotube #Carbon nanotube quantum dot #Composite material #Condensed matter physics #Coulomb #Coulomb blockade #Coupling (piping) #Electron #Force Microscopy Techniques and Applications #Materials science #Mechanical and Optical Resonators #Mode (computer interface) #Mode coupling #Molecular physics #Nanotechnology #Nanotube #Optics #Optoelectronics #Photonic and Optical Devices #Physics #Resonator #Softening #Stiffening #Voltage #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.86.041402
published in Physical Review B 86(4) (American Physical Society) · 8 pages, 4 figures
openalex publication_date 2012/07/09 · arxiv created 2012/07/10 · arxiv updated 2012/07/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The nonlinear interaction between two mechanical resonances of the same freely suspended carbon nanotube resonator is studied. We find that, in the Coulomb-blockade regime, the nonlinear modal interaction is dominated by single-electron-tunneling processes and that the mode-coupling parameter can be tuned with the gate voltage, allowing both mode-softening and mode-stiffening behaviors. This is in striking contrast to tension-induced mode coupling in strings where the coupling parameter is positive and gives rise to a stiffening of the mode. The strength of the mode coupling in carbon nanotubes in the Coulomb-blockade regime is observed to be 6 orders of magnitude larger than the mechanical-mode coupling in micromechanical resonators.