Influence of Many-Body Effect on Terahertz Quantum Well Photodetectors

SHAO Dixiang¹^,² GUO Xuguang¹ ZHANG Rong² WANG Feng² FU Zhanglong² WANG Haixia² YAO Chen² ZHOU Tao² CAO Juncheng² ZHUANG Songlin¹

(1.School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China 200093)
(2.Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, China 200050)

【Abstract】A terahertz quantum well photodetector (THz-QWP) is designed and the many-body effect is investigated in this device. By characterizing and analyzing the photocurrent spectrum of this device, it is found that the many-body effect changes the peak response frequency and causes the phenomenon of two response peaks, and thus it is confirmed that the many-body effect can deepen the depth of the effective well potential and simultaneously increase the energy spacing between the first excited state and the ground state. Therefore, it is important for the THz-QWP design to take the many-body effect into account.

【Keywords】 detectors; terahertz; quantum well; many-body effect; photodetectors;

【DOI】

【Funds】 National Basic Research Program of China (973 Program) (2014CB339803) National Instrumentation Program of China (2011YQ150021) National Natural Science Foundation of China (61574155, 61404149, 61404150, 61405233, 61604161) Project of Shanghai Science and Technology Committee (15ZR1447500, 15YF1414400, 15JC1403800, 15DZ0500103, 17YF1429900)

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(Translated by LIU HW)

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