Current-voltage characteristics of suspended single-wall carbon nanotube quantum dots show a series of steps equally spaced in voltage. The energy scale of this harmonic, low-energy excitation spectrum is consistent with that of the longitudinal low-k phonon mode (stretching mode) in the nanotube. Agreement is found with a Franck-Condon-based model in which the phonon-assisted tunneling process...

Intense electron-phonon scattering near the peak electric field in a semiconductor device results in nanometer-scale phonon hotspots. Past studies have argued that ballistic phonon transport near such hotspots serves to restrict heat conduction. We reexamine this assertion by developing a new phonon transport model. In a departure from previous studies, we treat isotropic dispersion in all phon...

a theory is presented for the dispersion relations of the nonlinear phonon-polaritons arising when phonons are coupled to the electromagnetic waves in multilayered structures of nonlinear materials. the calculations are applied to a multilayered structure consisting of a thin film surrounded by semi-infinite bounding media where each layer may have a frequency dependent dielectric function and ...

A detailed study of the low frequency behaviour of the phonon spectrum for 3dimensional tiling models of icosahedral quasicrystals is presented, in commensurate approxima-

The correlation between the Raman peak shift and the linewidth of porous silicon is studied. The experimental result does not fit with the relationship predicted by the phonon confinement model. By taking into account both the phonon confinement and ‘the effect of strain, the calculated Raman line shape coincides fairly well with the measured spectrum. The built-in strain of porous silicon vari...

Far infrared magnetophotoconductivity performed on high purity GaAs reveals the existence of fine structures in the resonant magnetopolaron regions. The fine structures are attributed to the presence of bound phonons due to multiphonon processes. We demonstrate that the magnetopolaron energy spectrum consists of bound phonon branches and magnetopolaron branches. Our results also indicate that d...

In this work, we revisit kinks and their interactions in the parametrically modified sine-Gordon (pmsG) equation. The central motivating question of our work is the following: what is the mechanism which in the absence of internal modes generates phonon radiation and causes the inelasticity of collisions in a near-integrable system? We do not give a complete answer to this question but rather w...

Fig. 1. Energy spectrum of nuclear resonant scattering of all 57Fe atoms in Fe3O4. It is well known that all atoms oscillate in a solid material even at low temperature, and their quantized vibrations are known as phonons. Except for simple materials, different kinds of atoms are usually contained in a material, and the properties of their oscillations are generally not the same. The atomic mot...

Using a numerically determined ground state of the infinite Frenkel-Kontorova chain and the method of real-space Green’s function, we have calculated the phonon dispersion curve of the incommensurate phase of this system. The phonon frequency spectrum exhibits modes with varying degrees of localization ranging from a free-sliding mode to quasiextended and localized modes. Succinct explanations ...

A general study of excitations up to two-phonon states is carried out using the intrinsic-state formalism of the Interacting Boson Model (IBM). Spectra and transitions for the different dynamical symmetries are analyzed and the correspondence with states in the laboratory frame is established. The influence of multi-phonon states is discussed. The approach is useful in problems where the comple...