准一维ttt (tcnq)2晶体中声子行为的三维近似分析

Silvia Andronic, Ionel Sanduleac
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引用次数: 0

摘要

本文主要研究了TTT(TCNQ)2准一维有机晶体中金属-绝缘体的转变。该研究利用三维近似方法,并引入了一个包含两个基本电子-声子相互作用的物理模型。第一个相互作用类似于变形势,而第二个相互作用遵循极化子类型的行为。通过采用随机相位近似,计算了不同温度和不同量纲费米动量kF值下的重整化声子谱。结果表明,相变具有Peierls型特征,并确定了与Peierls相变相关的临界温度。此外,一个有趣的观察是,佩尔斯临界温度经历显著降低随着载流子浓度的增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
ANALYSIS OF PHONONS BEHAVIOR IN QUASI-ONE-DIMENSIONAL CRYSTALS OF TTT(TCNQ)2 NEAR THE PEIERLS STRUCTURAL TRANSITION IN A 3D APPROXIMATION
This research paper focuses on investigating the metal-insulator transition occurring in quasi-one-dimensional organic crystals of TTT(TCNQ)2. The study utilizes a 3D approximation approach and introduces a physical model that incorporates two essential electron-phonon interactions. The first interaction is akin to the deformation potential, while the second interaction follows a polaron type behavior. By employing the random phase approximation, the renormalized phonon spectrum is calculated across different temperatures and various values of the dimensionless Fermi momentum kF. The findings indicate that the transition exhibits characteristics of the Peierls type, and the critical temperature associated with the Peierls transition is determined. Furthermore, an interesting observation is made that the Peierls critical temperature experiences a notable decrease with an increase in carrier concentration.
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