Disordered hyperuniformity and thermal transport in monolayer amorphous carbon  

作　　者：Nianjie Liang Yuxi Wang Bai Song 

机构地区：[1]Department of Energy and Resources Engineering,Peking University,Beijing 100871,China [2]Department of Advanced Manufacturing and Robotics,Peking University,Beijing 100871,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2025年第2期145-152,共8页中国科学:物理学、力学、天文学(英文版)

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFA1203100);the National Natural Science Foundation of China(Grant No.52076002);the High-performance Computing Platform of Peking University;support from the New Cornerstone Science Foundation through the XPLORER PRIZE。

摘　　要：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 properties.However,despite the fundamental and technological importance of thermal transport in amorphous solids,the effect of DHU remains largely unexplored.Here,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 hyperuniformity.Subsequently,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 0.024.Remarkably,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 flat.Mode-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 transport.Our 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 

分 类 号：O469[理学—凝聚态物理]