We present an analysis of the vibrational dynamics of metal vicinal surfaces using the embedded atom method to describe the interaction potential and both a real space Green’s function method and a slab method to calculate the phonons. We report two main general characteristics : a global shift of the surface vibrational density of states resulting from a softening of the force field. The latte...

We discuss the inhibition of anharmonic spontaneous multiphonon decay by energymomentum conservation and the reduction of isotope scattering by the sharing of ionic motion to permit a frequency window for long-lived transverse acoustic phonons. l.~ntroduction Recent high frequency phonon experiments have revealed anomalously long phonon lifetimes at low temperatures.' Indeed, for phonons genera...

The consequence of the phonon confinement on the phonon spectra particularly the low frequency spectra in nanocrystal quantum dots has been investigated. Due to the phonon confinement effect, there appears spheroidal and quadrupolar modes of nanoparticles in the low frequency spectra. The frequency of these modes increases with the decrease of the size of the nanocrystal quantum dot (nanopartic...

Alexandr I. Cocemasov,1 Denis L. Nika,1,2,* and Alexander A. Balandin2,3,† 1E. Pokatilov Laboratory of Physics and Engineering of Nanomaterials, Department of Theoretical Physics, Moldova State University, Chisinau, MD-2009, Republic of Moldova 2Nano-Device Laboratory, Department of Electrical Engineering, Bourns College of Engineering, University of California–Riverside, Riverside, California ...

The unconventional Weyl point with nonlinear dispersion features higher topological charge $|\mathcal{C}|>1$ and multiple topologically protected Fermi arc states at its boundary. As a novel state, it has been attracting widespread attention. However, the $|\mathcal{C}|=3$ not yet reported in realistic materials, even though theoretically proposed for more than decade. In this work, based on...