Phononic properties of a periodic nanostructure including vacuum gap in the presence of effective interatomic interactions,Physical Review E

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Phononic properties of a periodic nanostructure including vacuum gap in the presence of effective interatomic interactions
Physical Review E ( IF 2.2 ) Pub Date : 2021-09-16 , DOI: 10.1103/physreve.104.034121
Leila Ghaderipoor ₁ , Mohammad Mardaani _{1,

2} , Ehsan Amooghorban _{1,

2} , Hassan Rabani _{1,

2}

Affiliation

Using the harmonic approximation and Green's function technique, we investigate the contribution of phonons to heat transport across a narrow vacuum gap by an extended mass-spring chain model. We base the investigation on the van Beest–Kramer–van Santen potential that applies to two cases of simple and alternating mass systems at a finite temperature. Employing this model, we show that in specific values of interaction strengths, incoming phonon frequency, and gap distance, the phonon transmission across the vacuum gap can be improved. Finally, the thermal conductance of the system is computed as a function of interaction strength, gap distance, and temperature. These calculations reveal a suitable fitting function that can provide valuable insight into determining the internal interaction strengths from this quantity or controlling it by variation of the gap distance.

中文翻译：

存在有效原子间相互作用时包括真空间隙的周期性纳米结构的声子特性

使用调和近似和格林函数技术，我们通过扩展的质量弹簧链模型研究声子对穿过狭窄真空间隙的热传输的贡献。我们基于适用于有限温度下简单和交替质量系统的两种情况的 van Beest-Kramer-van Santen 势进行研究。使用该模型，我们表明在相互作用强度、传入声子频率和间隙距离的特定值中，可以改善穿过真空间隙的声子传输。最后，系统的热导计算为相互作用强度、间隙距离和温度的函数。

更新日期：2021-09-16

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