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arXiv 2606.26697cond-mat.mtrl-scicond-mat.mes-hall
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纳米颗粒组装体中尺寸依赖的声子限制导致的热整流

Thermal Rectification from Size-Dependent Phonon Confinement in Nanoparticle Assemblies

Università degli Studi di Milano(米兰大学);Interdisciplinary Centre for Nanostructured Materials and Interfaces (CIMaINa)(纳米材料与界面跨学科中心);German Aerospace Centre (DLR), Institute of Space Research(德国航空航天中心空间研究所);Physikalisch-Technische Bundesanstalt (PTB) Berlin(德国联邦物理技术研究院)

Megan J. Farrington, David J. Wasserman, Eden R. Josza, Alessandro Podestà, Alessio Zaccone, Mariia Sidorova, Alexej D. Semenov, Nicola Ludwig, Marcel Di Vece

AI总结:

利用纳米颗粒中声子限制引起的态密度尺寸依赖性修饰,制造简单声子整流器,并通过不同尺寸纳米颗粒重叠层实现宏观声子二极管,测量温度分布验证整流效果。

摘要:

热绝缘在从居住空间到量子技术的众多应用中仍然是一个重要的技术挑战。在这里,我们利用纳米颗粒中声子限制引起的声子态密度的尺寸依赖性修饰,制造了一个简单的声子整流器。两个相连纳米颗粒中较小的一个施加更强的声子限制,导致整流声子输运。通过构建两层不同尺寸纳米颗粒的重叠层,这一概念被扩展到宏观尺度,从而实现了一个宏观声子二极管。通过激光光局部加热,利用红外成像测量了声子二极管上的温度分布。尽管整流强度适中,但丰富的优化可能性使得这种方法在纳米和宏观尺度上对于超低体积热绝缘具有前景。

英文摘要:

Thermal insulation remains an important technological challenge across the vast number of applications, from living quarters to quantum technology. Here, we exploit the size-dependent modification of the phonon density of states arising from phonon confinement in nanoparticles to fabricate a simple phonon rectifier. The smaller of the two connected nanoparticles imposes stronger phonon confinement leading to rectifying phonon transport. This concept is extended to the macroscale by constructing two overlapping layers of differently sized nanoparticles, thereby realizing a macroscopic phonon diode. Following the localized heat deposition by laser light, the temperature profiles across a phonon-diode were measured by infrared imaging. Although the rectifying strength is moderate, the abundance of optimization possibilities makes this method promising for ultra-low volume thermal insulation at both the nano- and macroscale

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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