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disordered hyperuniformity and thermal transport in monolayer amorphous carbon

Science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 145-152页

作者： Nianjie Liang Yuxi Wang Bai Song Department of Energy and Resources Engineering Peking UniversityBeijing 100871China Department of Advanced Manufacturing and Robotics Peking UniversityBeijing 100871China

disordered hyperuniformity(DHU)is a recently discovered novel state of amorphous systems characterized by strongly suppressed density fluctuations at large length scales as in crystalline materials,which offers great potential for achieving unusual mechanical,electronic,and photonic ***,despite the fundamental and technological importance of thermal transport in amorphous solids,the effect of DHU remains largely ***,we theoretically study thermal transport in a class of two-dimensional DHU materials—monolayer amorphous carbon(MAC).Beginning with a perfect graphene lattice,we continuously apply Stone-Wales transformations to generate a series of MAC models with varied degrees of disorder and defects,which are quantified through comprehensive structural analysis including the so-called hyperuniformity index(H),where a smaller H indicates a higher degree of ***,we conduct molecular dynamics simulations to obtain the thermal conductivity(κ).A significant correlation between the thermal transport behavior and degree of hyperuniformity is observed,with the room-temperatureκdecreasing from 26.3 to 5.3 W m^(-1)K^(-1)while H is tuned from 0.0004 to ***,two distinct transport regimes are identified,including a nearly-DHU regime at small H(<0.005)whereκdrops sharply and a non-DHU region at larger H whereκbecomes relatively ***-resolved analysis reveals longer lifetime and higher participation ratio for the heat carriers in nearly-DHU MAC,implying that the hidden long-range correlations could support extended modes that enhance *** work highlights the impact of DHU on the thermal properties of amorphous materials and represents a conceptual advancement that is worthy of future exploration.

关键词： disordered hyperuniformity thermal transport amorphous material two-dimensional monolayer amorphous carbon

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Soft and disordered hyperuniform elastic metamaterials for highly efficient vibration concentration

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National Science Review 2022年第1期9卷 92-99页

作者： Hanchuan Tang Zhuoqun Hao Ying Liu Ye Tian Hao Niu Jianfeng Zang School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology

Vibrations,which widely exist throughout the world,could be a nearly endless and locally obtained green energy *** has been a long-standing challenge to efficiently utilize dispersed vibration energy,especially within the high-frequency range,since the amplitudes of high-frequency vibrations in local parts of objects are relatively ***,for the first time,we propose a soft and disordered hyperuniform elastic metamaterial(DHEM),achieving a remarkable concentration of vibrations in broad frequency bands by a maximum enhancement factor of～4000 at 1930 *** DHEM,with rational sizes from～1 cm to～1000 cm,covers a broad range of frequencies from～10 Hz to～10 kHz,which are emitted by many vibration sources including domestic appliances,factories and transportation systems,for ***,the performance of the soft DHEM under deformation is validated,enabling conformal attachments on uneven *** findings lay the groundwork for reducing traditional energy consumption by recovering some of the energy dissipated by devices in the working world.

关键词： elastic metamaterials soft materials disordered hyperuniformity acoustic black holes vibration concentration

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