Terahertz Photocurrent in Point Contact Devices
Quantum point contacts(QPCs)are nanoscale constrictions for electron wave packets.QPCs are usually realized in a high-mobility two-dimensional electron gas(2DEG)by applying negative bias to split Schottky gates.We explored the photocurrent in point contact(PC)devices induced by terahertz(THz)electromagnetic wave in the frequency range from 850 GHz to 930 GHz.Directional photocurrent were observed by varying the conductance of the point contacts.Furthermore,photocurrent from two point contacts in series was measured and exhibited fairly independent THz responses.A model based on homodyne mixing of THz electric field was examined.The results suggest that voltage-controlled nonlinear point contact devices could be suitable for high sensitive THz detection above 1 THz.
J.D.Sun D.M.Wu B.S.Zhang H.Qin
Key Laboratory of Nanodevice and Application,Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences,398 Ruoshui Road,Industrial Park,Suzhou City,Jiangsu 215123,China
国际会议
Progress in Electromagnetics Research Symposium 2011(2011年电磁学研究新进展学术研讨会)
苏州
英文
1227-1231
2011-09-01（万方平台首次上网日期，不代表论文的发表时间）