TITLE

Strong enhancement of terahertz response in GaAs/AlGaAs quantum well photodetector by magnetic field

AUTHOR(S)
Yu, C. H.; Zhang, B.; Lu, W.; Shen, S. C.; Liu, H. C.; Fang, Y.-Y.; Dai, J. N.; Chen, C. Q.
PUB. DATE
July 2010
SOURCE
Applied Physics Letters;7/12/2010, Vol. 97 Issue 2, p022102
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A strong enhancement of terahertz (THz) response in a GaAs/AlGaAs quantum well photodetector (QWP) is observed under perpendicular magnetic field. Photocurrent spectra show that besides partial contribution from an increase in the detector differential resistance, improvement of photoconductive gain induced by electron localization and Landau quantization of the in-plane electron motion in quantum wells is the predominant underlying mechanism. This study sheds light on the transport mechanism in THz QWPs and provides a possible means for enhancing THz QWP’s response.
ACCESSION #
52289437

 

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