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Quantum phonon transport through channels and molecules—A Perspective
Applied Physics Letters ( IF 4 ) Pub Date : 2022-04-21 , DOI: 10.1063/5.0088460
Bernd Gotsmann 1 , Andrea Gemma 1 , Dvira Segal 2, 3
Affiliation  

Phonon transport is a dominant mechanism of thermal conduction in solids that has been studied for decades. A good understanding of many transport regimes in micro- and nanostructures has been established, including ballistic and diffusive transport, mode softening, or band structure engineering in phononic crystals. However, the limit of quantized transport and the engineering of single transport channels is much less explored. In this Perspective, we discuss concepts and theoretical and experimental progress in the field of quantized phonon transport in channels, such as molecular systems. We particularly highlight open questions and research opportunities that should be within experimental reach. Challenges in experimental sensitivity and control hinder fast experimental progress. Recently, however, heat transport measurements through quantum channels and single molecules have become available at room temperature using break junction techniques. These techniques are well established in the molecular electronics community and have recently been expanded to the measurement of heat transport on the single-molecule level. Given the new experimental capabilities, it is now inviting to address the rather unexplored area of molecular phonon-engineering. Several interesting theoretical predictions concern the realization of the phonon quantum interference effect, suppression of phonon current via the introduction of side groups to molecules, and the construction of a phonon diode device based on molecular anharmonicity and asymmetry. This Perspective should serve the experimental and theory community by listing key challenges, thus a roadmap for making progress in the field of quantized phonon transport.

中文翻译:

通过通道和分子的量子声子传输——一个视角

声子传输是固体中热传导的主要机制,已经研究了几十年。已经建立了对微结构和纳米结构中许多传输机制的良好理解,包括弹道和扩散传输、模式软化或声子晶体中的能带结构工程。然而,量化传输的局限性和单一传输通道的工程研究却少得多。在这个观点中,我们讨论了通道中量子化声子传输领域的概念以及理论和实验进展,例如分子系统。我们特别强调应该在实验范围内的开放性问题和研究机会。实验灵敏度和控制方面的挑战阻碍了快速的实验进展。然而最近,通过量子通道和单分子的热传输测量已经可以在室温下使用断裂连接技术进行。这些技术在分子电子学界得到了很好的应用,最近已扩展到单分子水平上的热传输测量。鉴于新的实验能力,它现在正在邀请解决分子声子工程的相当未开发的领域。几个有趣的理论预测涉及声子量子干涉效应的实现、通过向分子引入侧基抑制声子电流,以及基于分子非谐性和不对称性构建声子二极管器件。这种观点应该通过列出关键挑战来服务于实验和理论界,
更新日期:2022-04-21
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