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17 Fall

10. Propagation of Acoustic Phonons I

조영달 2017.11.01 13:51 조회 수 : 10

When applied to a three‐dimensional geometry, the
stiffness (=elasticity) components couple two 3 x 3
matrices (i.e., Strain and Stress tensors). The nature
of the coupling is determined by the symmetry
properties of the particular crystal medium, which
determine a stiffness matrix.
In this chapter, we skip the deduction part of the
symmetry conditions of elasticity tensors but
introduce the simplified form for isotropic media.
The three‐dimensional wave equation is generally
referred to as the ChristoffeI equation based on
differential operations.

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