Friction-induced ultrafast charge transfer in van der Waals heterostructures  

作　　者：Chong Wang Rui Han Yutang Wang Shihong Chen Haowen Xu Shuchun Huang Zejun Sun Huixian Liu Jianbin Luo Dameng Liu Huan Liu 

机构地区：[1]State Key Laboratory of Tribology in Advanced Equipment,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China [2]School of Mechanical Engineering and Automation,Northeastern University,Shenyang 110819,China

出　　处：《Nano Research》2025年第3期429-435,共7页纳米研究(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.52425503,52475199,52105195,52075284,and 52350380).

摘　　要：van der Waals heterostructures stacked by transition metal dichalcogenides and graphene provide a new opportunity for exploring superlubricity.However,the further reduction of friction is limited by the unavoidable charge transfer in the heterostructures.The dynamics of charge transfer occur at picosecond time scale,which cannot be detected by traditional friction instruments,making the friction mechanism of charge transfer unclear.Here,we investigate friction-induced charge transfer in WS_(2)/graphene heterostructures with ultrafast friction energy dissipation detecting technique.The observed friction exhibits a strong linear relationship with the dissipation rate of interlayer charge transfer.By modulating the band structure of heterostructures,the dissipation rate of interlayer charge transfer can be efficiently tuned from 0.72 to 0.17 ps^(−1),resulting in a~35%reduction in friction.This work gives the direct explanation of friction-induced charge transfer,which enables the high-performance micro-electro-mechanical systems and new insight into the origin of friction from the perspective of ultrafast electron dynamics.

关 键 词：friction energy dissipation charge transfer ultrafast spectroscopy HETEROSTRUCTURES 

分 类 号：O57[理学—粒子物理与原子核物理]