Phonon modeDegeneracyGroup theoryA large class of phononic crystals and mechanical metamaterials exhibit glide symmetry that dictates their functionality or exceptional performance. The glide symmetry gives rise to a number of intriguing phenomena like sticking-bands and degeneracy in the phononic band ...
1.Analysis on Phonon Modes’ Symmetry Properties of NiSi/Si(001) FilmNiSi/Si(001)声子模式对称性分析 2.Role of the first optical phonon mode in phonon transport of carbon nanotubes;第一个光学声子模式对于碳纳米管声子输运的影响 3.THE EFFECTS OF THE DIFFERENT BRANCH PHONONS ON THE ENERGY OF ACC...
Phonon symmetry broken in git? I have a very simple example (MgO, 8x8x8 grid) that cause an infamous Error in routine find_mode_sym (1): unknown mode symmetry with the current git version of the code, but not with 6.4.1. It happened for me with both ifort 17 and gfortran 9.1....
We discuss the use of the symmetry selectivity of phonon Raman scattering to determine nanocrystallographic information of solids using tip‐enhanced Raman scattering (TERS). The necessary degrees of freedom arise from the combination of the Raman selection rules reflecting crystal symmetry superimposed ...
For comparing the molecular cluster model with the phonon model in describing the Jahn-Teller interaction for magnetic impurities in crystals, the Jahn-Teller energy and the Ham reduction factors are expressed in terms of the phonon Green's function of the host crystal for an orbital triplet coupl...
(SHG) wavelength, which is forbidden with a single beam in a bulk sample at equilibrium17,18,19. The FWM signal is studied as a function of the power and polarization of both the phonon-inducing pump and harmonic-generating probe, from which preferential symmetry axes are identified. More...
The TO mode is not Raman active in the zinc blende lattice in the backscattering geometry, but emerges as a result of the symmetry lowering in GaAsN. Both the disorder activated TO mode and the Ga-N local vibrational mode (LVM) are prominent at 90 K, and their intensities decrease with ...
We find that there are infinite POP branches, which can be denoted by a quantum number n(n=1,2,…), with definite symmetry with respect to the center of symmetry of the QW structure. The dispersion of the POP modes wi 展开 DOI: 10.1103/PhysRevB.70.115318 被引量: 76 ...
We study the thermal distribution of phonons in a graphene sheet. Due to the two electronic bands there are two out-of-plane phonon modes with respect to the two sublattices. One of these modes undergoes an Ising transition by spontaneously breaking the sublattice symmetry. We calculate the ...
We present systematic ab-initio study on the phonon mode potential as a source of anharmonicity in the crystal. As an example, the transverse optical (TO) mode potential in PbTe has been fitted to density-functional-theory calculated energies of phonons