Unlocking the Potential of Two-Dimensional Janus Superlattices:Directly Visualizing Phonon Transitions  

作　　者：刘应州 岳津丞 刘一浓 年磊磊 胡世谦 Yingzhou Liu;Jincheng Yue;Yinong Liu;Lei-Lei Nian;Shiqian Hu(School of Physics and Astronomy,Yunnan University,Kunming 650091,China)

机构地区：[1]School of Physics and Astronomy,Yunnan University,Kunming 650091,China

出　　处：《Chinese Physics Letters》2023年第8期46-52,共7页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12105242,12204405);the Yunnan Fundamental Research Project(Grant Nos.202201AT070161,202301AW070006,202301AT070108);the Graduate Scientific Research and Innovation Fund of Yunnan University(Grant No.KC-22221061)。

摘　　要：Recent research has focused on using Anderson's localization concept to modulate coherent phonon transport by introducing disorder into periodic structures.However,designing and identifying the disorder's strength remain challenging,and visual evidence characterizing phonon localization is lacking.Here,we investigate the effect of disorder on coherent phonon transport in a two-dimensional Janus MoSSe/WSSe superlattice with a defined disorder strength.Using non-equilibrium molecular dynamics,we demonstrate that strong disorder can lead to strong phonon localization,as evidenced by smaller thermal conductivity and significantly different dependence on defect ratio in strongly disordered structures.Furthermore,we propose a novel defect engineering method to determine whether phonon localization occurs.Our work provides a unique platform for modulating coherent phonon transport and presents visual evidence of the phonon transition from localization to nonlocalization.These findings will contribute to development of phonon transport and even phononics,which are essential for thermoelectric and phononic applications.

关 键 词：PHONON COHERENT DEFECT 

分 类 号：TB34[一般工业技术—材料科学与工程] TN03[电子电信—物理电子学]