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    General three-dimensional thermal illusion metamaterials
    Tianfeng Liu(刘天丰), Zhaochen Wang(王兆宸), Zhan Zhu(朱展), and Run Hu(胡润)
    Chin. Phys. B, 2024, 33 (4): 044401.   DOI: 10.1088/1674-1056/ad09aa
    Abstract2)      PDF (743KB)(0)      
    Thermal illusion aims to create fake thermal signals or hide the thermal target from the background thermal field to mislead infrared observers, and illusion thermotics was proposed to regulate heat flux with artificially structured metamaterials for thermal illusion. Most theoretical and experimental works on illusion thermotics focus on two-dimensional materials, while heat transfer in real three-dimensional (3D) objects remains elusive, so the general 3D illusion thermotics is urgently demanded. In this study, we propose a general method to design 3D thermal illusion metamaterials with varying illusions at different sizes and positions. To validate the generality of the 3D method for thermal illusion metamaterials, we realize thermal functionalities of thermal shifting, splitting, trapping, amplifying and compressing. In addition, we propose a special way to simplify the design method under the condition that the size of illusion target is equal to the size of original heat source. The 3D thermal illusion metamaterial paves a general way for illusion thermotics and triggers the exploration of illusion metamaterials for more functionalities and applications.
    Thermal transport in composition graded silicene/germanene heterostructures
    Zengqiang Cao(曹增强), Chaoyu Wang(王超宇), Honggang Zhang(张宏岗), Bo You(游波), and Yuxiang Ni(倪宇翔)
    Chin. Phys. B, 2024, 33 (4): 044402.   DOI: 10.1088/1674-1056/ad1500
    Abstract9)      PDF (2677KB)(6)      
    Through equilibrium and non-equilibrium molecular dynamics simulations, we have demonstrated the inhibitory effect of composition graded interface on thermal transport behavior in lateral heterostructures. Specifically, we investigated the influence of composition gradient length and heterogeneous particles at the silicene/germanene (SIL/GER) heterostructure interface on heat conduction. Our results indicate that composition graded interface at the interface diminishes the thermal conductivity of the heterostructure, with a further reduction observed as the length increases, while the effect of the heterogeneous particles can be considered negligible. To unveil the influence of composition graded interface on thermal transport, we conducted phonon analysis and identified the presence of phonon localization within the interface composition graded region. Through these analyses, we have determined that the decrease in thermal conductivity is correlated with phonon localization within the heterostructure, where a stronger degree of phonon localization signifies poorer thermal conductivity in the material. Our research findings not only contribute to understanding the impact of interface gradient-induced phonon localization on thermal transport but also offer insights into the modulation of thermal conductivity in heterostructures.
    Influence of substrate effect on near-field radiative modulator based on biaxial hyperbolic materials
    Ruiyi Liu(刘睿一), Haotuo Liu(刘皓佗), Yang Hu(胡杨), Zheng Cui(崔峥), and Xiaohu Wu(吴小虎)
    Chin. Phys. B, 2024, 33 (4): 044403.   DOI: 10.1088/1674-1056/ad2a6c
    Abstract2)      PDF (1432KB)(0)      
    Relative rotation between the emitter and receiver could effectively modulate the near-field radiative heat transfer (NFRHT) in anisotropic media. Due to the strong in-plane anisotropy, natural hyperbolic materials can be used to construct near-field radiative modulators with excellent modulation effects. However, in practical applications, natural hyperbolic materials need to be deposited on the substrate, and the influence of substrate on modulation effect has not been studied yet. In this work, we investigate the influence of substrate effect on near-field radiative modulator based on $\alpha $-MoO$_{3}$. The results show that compared to the situation without a substrate, the presence of both lossless and lossy substrate will reduce the modulation contrast (MC) for different film thicknesses. When the real or imaginary component of the substrate permittivity increases, the mismatch of hyperbolic phonon polaritons (HPPs) weakens, resulting in a reduction in MC. By reducing the real and imaginary components of substrate permittivity, the MC can be significantly improved, reaching 4.64 for $\varepsilon_{\rm s} = 3$ at $t = 10 $ nm. This work indicates that choosing a substrate with a smaller permittivity helps to achieve a better modulation effect, and provides guidance for the application of natural hyperbolic materials in the near-field radiative modulator.
    Controlled thermally-driven mass transport in carbon nanotubes using carbon hoops
    Yaolong Li(李耀隆), Songyuan Li(李松远), Meifen Wang(王美芬), and Renliang Zhang(张任良)
    Chin. Phys. B, 2024, 33 (4): 046101.   DOI: 10.1088/1674-1056/ad14ff
    Abstract1)      PDF (446KB)(0)      
    Controlling mass transportation using intrinsic mechanisms is a challenging topic in nanotechnology. Herein, we employ molecular dynamics simulations to investigate the mass transport inside carbon nanotubes (CNT) with temperature gradients, specifically the effects of adding a static carbon hoop to the outside of a CNT on the transport of a nanomotor inside the CNT. We reveal that the underlying mechanism is the uneven potential energy created by the hoops, i.e., the hoop outside the CNT forms potential energy barriers or wells that affect mass transport inside the CNT. This fundamental control of directional mass transportation may lead to promising routes for nanoscale actuation and energy conversion.
    Phonon transport properties of Janus Pb2XAs (X = P, Sb, and Bi) monolayers: A DFT study
    Jiaxin Geng(耿嘉鑫), Pei Zhang(张培), Zhunyun Tang(汤准韵), and Tao Ouyang(欧阳滔)
    Chin. Phys. B, 2024, 33 (4): 046501.   DOI: 10.1088/1674-1056/ad2260
    Abstract3)      PDF (2429KB)(0)      
    Grasping the underlying mechanisms behind the low lattice thermal conductivity of materials is essential for the efficient design and development of high-performance thermoelectric materials and thermal barrier coating materials. In this paper, we present a first-principles calculations of the phonon transport properties of Janus Pb2PAs and Pb2SbAs monolayers. Both materials possess low lattice thermal conductivity, at least two orders of magnitude lower than graphene and h-BN. The room temperature thermal conductivity of Pb2SbAs (0.91 W/mK) is only a quarter of that of Pb2PAs (3.88 W/mK). We analyze in depth the bonding, lattice dynamics, and phonon mode level information of these materials. Ultimately, it is determined that the synergistic effect of low group velocity due to weak bonding and strong phonon anharmonicity is the fundamental cause of the intrinsic low thermal conductivity in these Janus structures. Relative regular residual analysis further indicates that the four-phonon processes are limited in Pb2PAs and Pb2SbAs, and the three-phonon scattering is sufficient to describe their anharmonicity. In this study, the thermal transport properties of Janus Pb2PAs and Pb2SbAs monolayers are illuminated based on fundamental physical mechanisms, and the low lattice thermal conductivity endows them with the potential applications in the field of thermal barriers and thermoelectrics.
    Wide frequency phonons manipulation in Si nanowire by introducing nanopillars and nanoparticles
    Yatao Li(李亚涛), Yingguang Liu(刘英光), Xin Li(李鑫), Hengxuan Li(李亨宣), Zhixiang Wang(王志香), and Jiuyi Zhang(张久意)
    Chin. Phys. B, 2024, 33 (4): 046502.   DOI: 10.1088/1674-1056/ad0290
    Abstract2)      PDF (937KB)(0)      
    The combination of different nanostructures can hinder phonons transmission in a wide frequency range and further reduce the thermal conductivity (TC). This will benefit the improvement and application of thermoelectric conversion, insulating materials and thermal barrier coatings, etc. In this work, the effects of nanopillars and Ge nanoparticles (GNPs) on the thermal transport of Si nanowire (SN) are investigated by nonequilibrium molecular dynamics (NEMD) simulation. By analyzing phonons transport behaviors, it is confirmed that the introduction of nanopillars leads to the occurrence of low-frequency phonons resonance, and nanoparticles enhance high-frequency phonons interface scattering and localization. The results show that phonons transport in the whole frequency range can be strongly hindered by the simultaneous introduction of nanopillars and nanoparticles. In addition, the effects of system length, temperature, sizes and numbers of nanoparticles on the TC are investigated. Our work provides useful insights into the effective regulation of the TC of nanomaterials.
    Phonon resonance modulation in weak van der Waals heterostructures: Controlling thermal transport in graphene-silicon nanoparticle systems
    Yi Li(李毅), Yinong Liu(刘一浓), and Shiqian Hu(胡世谦)
    Chin. Phys. B, 2024, 33 (4): 047401.   DOI: 10.1088/1674-1056/ad1501
    Abstract7)      PDF (3914KB)(1)      
    The drive for efficient thermal management has intensified with the miniaturization of electronic devices. This study explores the modulation of phonon transport within graphene by introducing silicon nanoparticles influenced by van der Waals forces. Our approach involves the application of non-equilibrium molecular dynamics to assess thermal conductivity while varying the interaction strength, leading to a noteworthy reduction in thermal conductivity. Furthermore, we observe a distinct attenuation in length-dependent behavior within the graphene-nanoparticles system. Our exploration combines wave packet simulations with phonon transmission calculations, aligning with a comprehensive analysis of the phonon transport regime to unveil the underlying physical mechanisms at play. Lastly, we conduct transient molecular dynamics simulations to investigate interfacial thermal conductance between the nanoparticles and the graphene, revealing an enhanced thermal boundary conductance. This research not only contributes to our understanding of phonon transport but also opens a new degree of freedom for utilizing van der Waals nanoparticle-induced resonance, offering promising avenues for the modulation of thermal properties in advanced materials and enhancing their performance in various technological applications.
ISSN 1674-1056   CN 11-5639/O4

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