Prof. Hongzhi Fu
Luoyang Normal University, China
|Title: Elastic Anisotropy Modulates Phonon Focusing|
Theoretical calculations of the three dimensional slowness surfaces give insights into the mixing of longitudinal and transverse modes and show the origin of the phonon caustics. The phonon focusing due to the elastically anisotropy, and the phonon phase and group velocities are explained. In general, the propagation of elastic waves in crystals is strongly affected by the elastic anisotropy of the lattice.The topological structures of three dimensional slowness surfaces show the origin of the phonon caustics due to the fact that the phonon phase velocity and group velocity are generally not collinear in elastically anisotropic crystals. The comparative investigations between anisotropy and slowness show that the propagation of elastic wave is affected by the elastic anisotropy of the lattice, and the phonon caustics “walk along” the extreme direction of elastic anisotropy.
Dr. Hongzhi Fu (Ph.D.-physics), now is an professor of Physics of Luoyang Normal University, and teaches Solid State Physics, Superconductivity Physics and Semiconductor Physics. He got his Ph.D in 2007 at the Atomic and Molecular Physics of Sichuan University, China, and done postdoctoral research at the State Key Laboratory of Superhard Materials, Jilin university, China from 2009.9 ~ 2013.6; 2014~till now, Professor at School of physics and electronic information, Luoyang Normal University, 2009~2014, Associate Professor at School of physics and electronic information, Luoyang Normal University, 2007~2009, Letter at School of physics and electronic information, Luoyang Normal University. Previously he studied the lattice dynamics and phase transformation. Currently Dr. Hongzhi Fu’ researches focus on the theoretical study of structural, electronic structural, elastic anisotropy of bulk materials, and the Monte Carlo scheme for the phonon images, using bond stress transformation matrices and green function, etc. He published more than 60 academic papers, which cited more than 800 times. He is a peer reviewers for the following English journals--Intermetallics, J. Alloys Compd.,Solid State Sci., Surf Interface Anal., J. Phys. Chem. Solids., Physica B, Bull. Mater. Sci., Phys. Status Solidi B, Solid State Commun., Mater. Chem. Phys, J. Mater. Sci, Eur Phys J B, Comput. Mater. Sci., etc.