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arXiv 1002.0294cond-mat.mtrl-sci
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极性晶体中电子-声子相互作用的长波性质

Long wavelength properties of electron-TO-phonon interactions in polar crystals

Aleksandr Pishtshev

摘要:

对电子与极性长波长横光学振动相互作用进行了理论分析。该理论基于具有经典势的极性晶体模型,考虑了电子极化率效应。发现铁电体中电子-声子相互作用的强度显著增强,并给出了这种效应的微观解释。一个桥梁,涉及到电子的相互作用与极性长波长TO模式的晶格振动的长程偶极-偶极相互作用的建立。作为我们分析的应用,得到了一个新的电子-声子相互作用常数与材料参数之间的关系式。

英文摘要:

Theoretical analysis dealing with the interaction of electrons with the polar long-wavelength transverse optical (TO) vibrations is presented. The theory is based on the model of a polar crystal with classical potentials, which takes into account the electronic polarizability effects. A significant enhancement of the strength of the electron-TO-phonon interaction in ferroelectrics is found. A microscopic justification of this effect is given. A bridge that relates the interaction of electrons with the polar long-wavelength TO modes of the lattice vibrations to the long-range dipole-dipole interaction is established. As an application of our analysis, a new equation representing the relationship between the electron-TO-phonon interaction constant and material parameters is obtained.

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