Open AccessStudy of persistent photoconductivity and subband electronic properties of the two-dimensional electron gas in modulation doped GaAs/AlGaAs structure
Author(s) -
Qiang Sheng,
Shu Yong-chun,
Guanjie Zhang,
L.G. Rubin,
Yao Jiang-Hong,
Biao Pi,
Xiaodong Xing,
Lin Yao-Wang,
Jingjun Xu,
Zhanguo Wang
Publication year - 2006
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.55.1379
Subject(s) - electron , fermi gas , condensed matter physics , photoconductivity , quantum well , doping , shubnikov–de haas effect , electron density , oscillation (cell signaling) , materials science , physics , diode , quantum hall effect , hall effect , magnetic field , quantum oscillations , chemistry , optoelectronics , optics , quantum mechanics , laser , biochemistry
We obtained the high mobility of μ2K=1.78×106 cm2/V·s in Si-doped GaAs/AlGaAs two-dimensional electron gas (2DEG) structures . After the sample was illuminated by a light-emitting diode in magnetic fields up to 6 T at T=2K, we did observe the persistent photoconductivity effect and th e electron density increased obviously. The electronic properties of 2DEG have b een studied by Quantum-Hall-effect and Shubnikov-de Haas (SdH) oscillation measu rements. We found that the electron concentrations of two subbands increase simu ltaneity with the increasing total electron concentration, and the electron mobi lity also increases obviously after being illuminated. At the same time, we also found that the electronic quantum lifetime becomes shorter, and a theoretical e xplunation is given through the widths of integral quantum Hall plateaus.