Recently, first principle-based predictions of lattice thermal conductivity κ from perturbation theory have achieved significant success. However, it only includes three-phonon scattering due to the assumption that fourphonon and higher-order processes are generally unimportant. Also, directly evaluating the scattering rates of fourphonon and higher-order processes has been a long-standing chal...

Linear Paul traps have been used recently to simulate the transverse-field Isingmodel with long-range spin-spin couplings.We study the intrinsic effects of phonon creation (from the initial phonon ground state) on the spin-state probability and spin entanglement for such quantum spin simulators.While it has often been assumed that phonon effects are benign because they play no role in the pure ...

In this paper, we have used density functional perturbation theory (DFPT) and Pseudo-potential method to calculate the phonon spectrum, phonon density of states (DOS), specific heat capacity and mechanical properties of (5,5) armchair and (9,0) zigzag Single Wall Carbon Nanotubes (SWCNTs). Our calculations show that Young’s modulusfor (5,5) and (9,0) nanotubesare higher than 1TPa. We have also ...

GaN and AlN compounds have been proven useful in wide bandgap microelectronics and optoelectronics. Also properties of bulk GaN and AlN have been studied extensively. However, many characteristics of AlGaN/GaN superlattices are not well known. In particular, the properties of phonons have not been determined. In order to determine phonon properties, this study measured infrared reflectivity spe...

Phonons – quanta of crystal lattice vibrations – reveal themselves in all electrical, thermal and optical phenomena in materials. Nanostructures open exciting opportunities for tuning the phonon energy spectrum and related properties of materials for specific applications. A recent advent of graphene and quasi two-dimensional materials increased the possibilities for controlled modification of ...

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In 1984 Decker et al.' reported the measurement of thermal conductivity for freestanding thin films of Si02 and A1203. Values were found to be one to two orders of magnitude lower than those for the corresponding bulk materials. The authors attributed this difference to the unique microstructure of dielectric thin films (primarily columnar for vapor-deposited coatingsz), which, along with defec...