Polymorphic signal responses of phase-change quantum dot string upon stochastic resonance  

作　　者：Qin Wan Fei Zeng Ziao Lu Junwei Yu Feng Pan 

机构地区：[1]Key Laboratory of Advanced Materials(MOE),School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [2]Center for Brain Inspired Computing Research(CBICR),Tsinghua University,Beijing 100084,China

出　　处：《Nano Research》2025年第2期717-724,共8页纳米研究(英文版)

基　　金：The study was supported by the National Natural Science Foundation of China(No.51972192).

摘　　要：We successfully constructed phase-change quantum dots string(PCQDS)systems and studied their signal responses.The PCQDs actually is a cascaded structure consisted of several stochastic resonance(SR)two-state systems,in which inherent non-linearity,i.e.,phase-change of quantum dots(QDs),plays elementary and important roles to modulate signal output.We established an SR model to simulate signal responses depending on stimulation history.We know that some QDs will oscillate with input forcing frequency,while certain QDs will oscillate in their own frequency triggered by phase transition.These two effectscooperate togeneratepolymorphic response patterns,including action potential patterns exhibited by envelope of spike peak values.An interesting and important simulation is that we replicate the memory effect in Nb-doped AINO,i.e.,a QDs dispersed system.The result indicates that memory can occur in a system only constructed by volatile elementary units,implying memory existing in network.Long-term plasticity and spike-rate dependent plasticity can also be realized by using frequency and phase modulation.Our study provides a new scope to study signal handling and memory effect in quantum system.

关 键 词：quantum-dot string PHASE-CHANGE inherent nonlinearity signal modulation niobium oxide stochastic resonance 

分 类 号：O41[理学—理论物理]