Optical properties of exciton and charged exciton in undoped ZnSe/BeTe type- II quantum wells under high magnetic fields

被引：1
作者：
Ji Zi-Wu [1 ]
Zheng Yu-Jun [1 ]
Xu Xian-Gang [2 ]
机构：
[1] Shandong Univ, Sch Phys, Jinan 250100, Peoples R China
[2] Shandong Univ, State Key Lab Crystal Mat, Jinan 250100, Peoples R China
来源：
ACTA PHYSICA SINICA | 2011年 / 60卷 / 04期
基金：
中国国家自然科学基金;
关键词：
luminescence; two-dimensional electron gas; charged exciton; type- II quantum well; ELECTRON-GAS; PHOTOLUMINESCENCE; TRANSITIONS; TRION;
D O I：
10.7498/aps.60.047805
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report on the magnetic field (up to 53 T) dependence of photoluminescence (PL) spectra occurring as a spacially direct optical transition of the ZnSe layer in undoped ZnSe/BeTe/ZnSe type-II quantum structures at a low temperature (4.2 K). With magnetic field increasing, the PL intensity (Ix) of exciton (X) shows an oscillation feature opposite to the PL intensity (Ix-) of charged exciton ((X) over dot(-)). As I-x. increases, I-x decreases, but as I-x. decreases, I-x, increases. In all fields, the oscillation behaviour shows a periodic change approximately with magnetic field interval. The results are attributed to the periodic resonance of the Fermi level with the Landau level, which results in the modulation of the density of states of the 2DEG system at the Fermi energy.
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页数：5
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