Experimental observation of spontaneous chaotic current oscillations in GaAs/Al_(0.45)Ga_(0.55)As superlattices at room temperature  

作　　者：HUANG YuYang LI Wen MA WenQuan QIN Hua ZHANG YaoHui 

机构地区：[1]Suzhou Institute of Nano-tech and Nano-bionies Chinese Academy of Sciences,Suzhou 215123,China [2]Institute of Semiconductors,Chinese Academy of Sciences Beijing 100083,China

出　　处：《Chinese Science Bulletin》2012年第17期2070-2072,共3页

基　　金：supported by the Key Program of the National Natural Science Foundation of China (10834004);the Natural Science Fund of Jiangsu Province (BK2010005, BK2011362 and SBY201120087);China Postdoctoral Science Foundation Funded Project (2011M500953)

摘　　要：Spontaneous self-sustained chaotic current oscillations are observed experimentally in lightly-doped weakly-coupled GaAs/Al0.45Ga0.55As superlattices at room temperature for the first time.The mole fraction of Aluminum in the barrier is chosen to be 0.45 to suppress the thermal carrier leakage through the X-band valley,The effective nonlinearity induced by the sequential well-to-well resonant tunneling can still be strong enough to induce spontaneous chaotic current oscillations even at room temperature,The frequency spectrum of the chaotic current oscillations is ranged from DC to 4 GHz,which can be used as ultra-wide-band noise sources with a bandwidth of several Giga Hertz.Spontaneous self-sustained chaotic current oscillations are observed experimentally in lightly-doped weakly-coupled GaAs/ A10.45Gao.55As superlattices at room temperature for the first time. The mole fraction of Aluminum in the barrier is chosen to be 0.45 to suppress the thermal carrier leakage through the X-band valley. The effective nonlinearity induced by the sequential well-to-well resonant tunneling can still be strong enough to induce spontaneous chaotic current oscillations even at room temperature. The frequency spectrum of the chaotic current oscillations is ranged from DC to 4 GHz, which can be used as ultra-wide-band noise sources with a bandwidth of several Giga Hertz.

关 键 词：实验观察 超晶格 混沌 室温 振动 电流振荡 GAAS 摩尔分数 

分 类 号：O471[理学—半导体物理]