Four-dimensional vibrational spectroscopy for nanoscale mapping of phonon dispersion in BN nanotubes

Phonon Dispersion in Chiral Single-wall Carbon Nanotubes

The method to obtain phonon dispersion of achiral single-wall carbon nanotubes (SWNTs) from 6× 6 matrix proposed by Mahan and Jeon has been extended to chiral SWNTs. The number of calculated phonon modes of a chiral SWNT (10, 1) is much larger than that of a zigzag one (10, 0) because the number of atoms in the translational unit cell of chiral SWNT is larger than that of an achiral one even th...

Vibrational Properties of h-BN and h-BN-Graphene Heterostructures Probed by Inelastic Electron Tunneling Spectroscopy.

Inelastic electron tunneling spectroscopy is a powerful technique for investigating lattice dynamics of nanoscale systems including graphene and small molecules, but establishing a stable tunnel junction is considered as a major hurdle in expanding the scope of tunneling experiments. Hexagonal boron nitride is a pivotal component in two-dimensional Van der Waals heterostructures as a high-quali...

Nanoscale Vibrational Analysis of Single-walled Carbon Nanotubes

LLE Review, Volume 100 269 Introduction Since their discovery in the early 1990s by Iijima,1 carbon nanotubes have become the focus of intense interest by a vast number of scientists and engineers. The main reason behind such wide-ranging attention lies in their unique electrical,2 mechanical,3 thermal,3 and optical properties.4 Furthermore, from their size and structure, carbon nanotubes provi...

Nanoscale vibrational analysis of single-walled carbon nanotubes.

We use near-field Raman imaging and spectroscopy to study localized vibrational modes along individual, single-walled carbon nanotubes (SWNTs) with a spatial resolution of 10-20 nm. Our approach relies on the enhanced field near a laser-irradiated gold tip which acts as the Raman excitation source. We find that for arc-discharge SWNTs, both the radial breathing mode (RBM) and intermediate frequ...

Determination of two-dimensional phonon dispersion relation of graphite by Raman spectroscopy